{"title":"Backert Labs Stereo Pre-Amps","description":null,"products":[{"product_id":"backert-labs-rhumba-extreme-1-4a-linestage-tube-preamp","title":"Backert Labs Rhumba Extreme 1.4a Linestage Tube Preamp","description":"\u003c!-- ======================================================\nBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\nSEO-Optimized Shopify Product Page\n\nCURRENT 1.4a VERSION\nOverview Paragraphs: 2\nHighlights \u0026 Benefits: 5\nTechnology \u0026 Design: 4\nFAQ: 4\nRelated Products \u0026 Accessories: 4\nSpecifications: Scroll-Free CSS Grid\nBuilt-to-Order Note Included\nMSRP \/ Pricing Removed\nDuplicate Product Microdata Removed\n====================================================== --\u003e\n\u003cstyle\u003e\n.bh-wrap,\n.bh-wrap *,\n.bh-wrap *::before,\n.bh-wrap *::after{\n  box-sizing:border-box;\n}\n\n.bh-wrap{\n  width:100%;\n  max-width:1100px;\n  margin:0 auto;\n  padding:1rem 1.25rem;\n  line-height:1.6;\n}\n\n.bh-eyebrow{\n  display:block;\n  margin:0;\n  letter-spacing:.08em;\n  text-transform:uppercase;\n  font-size:.8rem;\n  opacity:.7;\n}\n\n.bh-title{\n  margin:.25rem 0 1rem;\n  font-size:2.75rem;\n  font-weight:700;\n  line-height:1.2;\n  overflow-wrap:normal;\n  word-break:normal;\n}\n\n.bh-intro{\n  margin:0 0 1.25rem;\n  font-style:italic;\n}\n\n.bh-order-note{\n  margin:1rem 0 1.5rem;\n  padding:1rem 1.1rem;\n  border:1px solid #d1d5db;\n  border-radius:.5rem;\n  background:#f8fafc;\n}\n\n.bh-order-note strong{\n  font-weight:700;\n}\n\n.bh-grid{\n  display:grid;\n  grid-template-columns:minmax(0,1fr);\n  gap:2rem;\n  width:100%;\n  max-width:100%;\n}\n\n.bh-main,\n.bh-side{\n  display:block;\n  width:100%;\n  min-width:0;\n  max-width:100%;\n  margin:0;\n  padding:0;\n  float:none;\n}\n\n@media(min-width:900px){\n  .bh-grid{\n    grid-template-columns:minmax(0,64%) minmax(0,36%);\n    gap:2rem;\n    align-items:start;\n  }\n}\n\n.bh-section{\n  width:100%;\n  max-width:100%;\n  margin:2rem 0;\n}\n\n.bh-section h2{\n  margin:0 0 1rem;\n  line-height:1.3;\n  overflow-wrap:normal;\n  word-break:normal;\n  hyphens:none;\n}\n\n.bh-section p,\n.bh-section li{\n  overflow-wrap:break-word;\n  word-break:normal;\n}\n\n.bh-bullets{\n  margin:.5rem 0 0;\n  padding-left:1.25rem;\n  list-style:disc;\n}\n\n.bh-bullets li{\n  margin-bottom:.45rem;\n}\n\n\/* Scroll-free specification grid *\/\n.bh-specs{\n  display:block;\n  width:100%;\n  min-width:0;\n  max-width:100%;\n  margin:0;\n  border-top:1px solid #e5e7eb;\n  border-left:1px solid #e5e7eb;\n  overflow:visible;\n}\n\n.bh-spec-row{\n  display:grid;\n  grid-template-columns:minmax(0,42%) minmax(0,58%);\n  width:100%;\n  min-width:0;\n}\n\n.bh-spec-label,\n.bh-spec-value{\n  min-width:0;\n  padding:.58rem;\n  border-right:1px solid #e5e7eb;\n  border-bottom:1px solid #e5e7eb;\n  font-size:.86rem;\n  line-height:1.4;\n  white-space:normal;\n  overflow-wrap:anywhere;\n  word-break:normal;\n  overflow:visible;\n}\n\n.bh-spec-label{\n  background:#f8fafc;\n  font-weight:600;\n}\n\n.bh-faq details{\n  margin:.5rem 0;\n  padding:.75rem 1rem;\n  border:1px solid #e5e7eb;\n  border-radius:.5rem;\n  background:#fafafa;\n}\n\n.bh-faq summary{\n  font-weight:600;\n  cursor:pointer;\n}\n\n@media(max-width:899px){\n  .bh-wrap{\n    padding:.75rem 1rem;\n  }\n\n  .bh-title{\n    font-size:2.1rem;\n  }\n\n  .bh-grid{\n    gap:.5rem;\n  }\n}\n\n@media(max-width:480px){\n  .bh-title{\n    font-size:1.8rem;\n  }\n\n  .bh-spec-row{\n    grid-template-columns:minmax(0,40%) minmax(0,60%);\n  }\n\n  .bh-spec-label,\n  .bh-spec-value{\n    padding:.48rem;\n    font-size:.8rem;\n  }\n}\n\u003c\/style\u003e\n\u003cdiv class=\"bh-wrap\"\u003e\n\u003cspan class=\"bh-eyebrow\"\u003eBackert Labs\u003c\/span\u003e\n\u003ch1 class=\"bh-title\"\u003eBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/h1\u003e\n\u003cp class=\"bh-intro\"\u003eReference Class A Tube Linestage • New 1.4a Pure Silver Wiring • New Chassis Ground Technology • Revised Circuit Board Layouts • Dual-Mono GreenForce Power Supply • Fully Balanced XLR Connectivity • Two 12AU7-Family Tubes • IsoAcoustics Gaia Feet • Solid Brass Bottom Panel\u003c\/p\u003e\n\u003cdiv class=\"bh-order-note\"\u003e\n\u003cstrong\u003eBuilt to Order:\u003c\/strong\u003e The Backert Labs Rhumba Extreme 1.4a is built to order. Typical lead time is approximately \u003cstrong\u003e10–14 business days\u003c\/strong\u003e before shipment.\u003c\/div\u003e\n\u003cdiv class=\"bh-grid\"\u003e\n\u003c!-- LEFT COLUMN --\u003e\n\u003cdiv class=\"bh-main\"\u003e\n\u003csection class=\"bh-section\" id=\"overview\"\u003e\n\u003ch2\u003eBackert Labs Rhumba Extreme 1.4a — Refined Tube Linestage Performance\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/strong\u003e advances the acclaimed Rhumba Extreme platform with the latest refinements from Backert Labs. Building upon the dual-mono power architecture, Class A circuitry, fully balanced connectivity and premium mechanical construction of the Rhumba Extreme 1.4, the new 1.4a introduces pure silver wire in select areas, new chassis-ground technology and redesigned circuit-board layouts developed to further improve clarity, texture and stereo imaging.\u003c\/p\u003e\n\u003cp\u003eAt its core, the Rhumba Extreme remains Backert Labs' bridge between the Rhumba and flagship Rhythm. Two 12AU7-family tubes operate within a zero-negative-feedback Class A circuit supported by Backert Labs' patented GreenForce power-supply technology. Dual-mono regulation, premium polypropylene capacitors, a solid-brass bottom panel, IsoAcoustics Gaia isolation feet and extensive balanced and single-ended connectivity make the Rhumba Extreme 1.4a equally suited to ambitious tube, solid-state and hybrid high-end audio systems.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"highlights\"\u003e\n\u003ch2\u003eHighlights \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew 1.4a Pure Silver Wiring\u003c\/strong\u003e — Select areas now incorporate pure silver wire, an upgrade Backert Labs developed to improve clarity and musical texture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew Chassis Ground Technology\u003c\/strong\u003e — Revised grounding technology is part of the 1.4a update, building upon the already refined architecture of the Rhumba Extreme.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRevised 1.4a Circuit Board Layouts\u003c\/strong\u003e — New circuit-board layouts have been developed specifically to improve imaging and spatial presentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Dual-Mono GreenForce Power Supply\u003c\/strong\u003e — Independent regulated power-supply paths for the left and right channels help maximize separation, dynamics and stereo dimensionality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Extreme Construction\u003c\/strong\u003e — A solid-brass bottom panel, IsoAcoustics Gaia isolation feet, automatic tube bias and premium polypropylene capacitors distinguish the Extreme architecture from the standard Rhumba.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"technology\"\u003e\n\u003ch2\u003eTechnology \u0026amp; Design\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe 1.4a Evolution\u003c\/strong\u003e — The new \u003cstrong\u003eBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/strong\u003e evolves the 1.4 rather than replacing its underlying design philosophy. Backert Labs specifies pure silver wiring in select locations for improved clarity and texture, new chassis-ground technology, and redesigned circuit-board layouts intended to deliver better imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Mono GreenForce Power Supply\u003c\/strong\u003e — The Extreme employs a fully dual-mono implementation of Backert Labs' patented GreenForce power-supply technology. Premium polypropylene capacitors are used extensively throughout the power supply, supporting the fast and dynamic presentation for which Backert Labs designs are known.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClass A Tube Signal Path \u0026amp; Automatic Bias\u003c\/strong\u003e — Two 12AU7 or equivalent tubes operate within Backert Labs' Class A gain stage without global or local negative feedback. Automatic and continuous tube-bias adjustment maintains appropriate operating conditions as tubes age or when compatible replacement tubes are installed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBalanced Architecture \u0026amp; Premium Mechanical Design\u003c\/strong\u003e — Two fully balanced XLR input pairs and two fully balanced XLR output pairs accompany three RCA inputs and two RCA outputs. A solid-brass bottom panel provides a substantial foundation for the internal circuitry, while IsoAcoustics Gaia feet mechanically isolate the chassis from its supporting surface.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section bh-faq\" id=\"faq\"\u003e\n\u003ch2\u003eFAQ — Backert Labs Rhumba Extreme 1.4a\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is new about the Rhumba Extreme 1.4a?\u003c\/summary\u003e\n\u003cp\u003eThe 1.4a is the newest evolution of Backert Labs' 1.4 platform. Backert Labs specifies three principal improvements: pure silver wire in select areas to improve clarity and texture, new chassis-ground technology, and new circuit-board layouts developed to improve imaging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the Rhumba Extreme 1.4a built to order?\u003c\/summary\u003e\n\u003cp\u003eYes. This \u003cstrong\u003eBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/strong\u003e is built to order. Typical lead time is approximately 10–14 business days before shipment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many tubes does the Rhumba Extreme 1.4a use?\u003c\/summary\u003e\n\u003cp\u003eThe Rhumba Extreme 1.4a uses two 12AU7 or equivalent tubes. Its automatic bias system continuously maintains the appropriate operating bias for the installed tubes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the Rhumba Extreme 1.4a be integrated into a home theater system?\u003c\/summary\u003e\n\u003cp\u003eYes. The rear panel includes a dedicated RCA Home Theater Bypass input. The bypass does not require the preamplifier to be powered on, making it easier to integrate a high-performance two-channel system with a compatible home theater processor or A\/V receiver.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"why-buy\"\u003e\n\u003ch2\u003eWhy Buy From Us\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eAuthorized Backert Labs Dealer\u003c\/li\u003e\n\u003cli\u003e5% Reward Points on Every Purchase\u003c\/li\u003e\n\u003cli\u003ePrice Match Guarantee\u003c\/li\u003e\n\u003cli\u003eExpert Tube, Power Amplifier and High-End Two-Channel System Matching Support\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"related\"\u003e\n\u003ch2\u003eRelated Backert Labs Products\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eBackert Labs Rhumba 1.4a Linestage Tube Preamplifier\u003c\/li\u003e\n\u003cli\u003eBackert Labs Rhythm 1.4a Linestage Tube Preamplifier\u003c\/li\u003e\n\u003cli\u003eBackert Labs Rhumba XPhono 1.1 Tube Phono Preamplifier\u003c\/li\u003e\n\u003cli\u003eBackert Labs Optik 1.1 Phono Equalizer for DS Audio Cartridges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c!-- RIGHT COLUMN --\u003e\n\u003cdiv class=\"bh-side\"\u003e\n\u003csection class=\"bh-section\" id=\"specs\"\u003e\n\u003ch2\u003eBackert Labs Rhumba Extreme 1.4a Specifications\u003c\/h2\u003e\n\u003cdiv class=\"bh-specs\" role=\"table\"\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eProduct Type\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eVacuum-tube linestage preamplifier\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eModel\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eRhumba Extreme 1.4a\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Silver-Wire Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePure silver wire used in select areas\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Grounding Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eNew chassis-ground technology\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Circuit Board Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eNew circuit-board layouts designed for improved imaging\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eAmplification\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eClass A\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eNegative Feedback\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eZero negative feedback\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Complement\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × 12AU7 or equivalent tubes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Bias\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eAutomatic and continuously adjusted\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eGain\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e10dB\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eOutput Impedance\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBelow 100 ohms\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTotal Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e5 stereo input pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBalanced Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × fully balanced stereo XLR pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRCA Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e3 × stereo RCA pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTotal Main Outputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e4 stereo output pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBalanced Outputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × fully balanced stereo XLR pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRCA Outputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × stereo RCA pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eREC OUT\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e1 × stereo RCA pair\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eHome Theater Bypass\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e1 × RCA input pair; preamp does not need to be powered on\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eFront-Panel Controls\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBalance, mute, mono\/stereo, input selector and volume\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003ePower Supply\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePatented GreenForce power-supply architecture\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eExtreme Power Supply\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eDual-mono power supply\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eMusic-Signal Power-Supply Capacitors\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePolypropylene capacitors; no electrolytic capacitors\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eOutput Capacitors\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eJantzen Silver polypropylene capacitors\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003ePower Transformer\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eCustom-made toroidal transformer\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBottom Panel\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eSolid brass\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eIsolation Feet\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eIsoAcoustics feet\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Access\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eTop-mounted acrylic tube-access door\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eVolume Indicator\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eLED-lighted volume knob\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRemote Control\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eHeavy metal handset with volume and mute control\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eFaceplate\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBlack or Silver\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eStandard Body\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBlack\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eOptional Body Colors\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eRed or Blue\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eManufacturing\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBuilt in Pennsylvania, USA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBuilt to Order\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eYes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTypical Lead Time\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eApproximately 10–14 business days\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eQuantity\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eEach\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBrand\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBackert Labs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"whats-in-the-box\"\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003e1 × Backert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/li\u003e\n\u003cli\u003e2 × 12AU7-Family Tubes, Installed\u003c\/li\u003e\n\u003cli\u003e1 × Heavy Metal Remote Handset\u003c\/li\u003e\n\u003cli\u003e1 × Acrylic Tube Access Door, Installed\u003c\/li\u003e\n\u003cli\u003eIsoAcoustics Isolation Feet, Installed\u003c\/li\u003e\n\u003cli\u003eAC Power Cord\u003c\/li\u003e\n\u003cli\u003eOwner's Documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePower amplifier, source components, interconnect cables, loudspeakers and other system components are sold separately.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Backert Labs","offers":[{"title":"Silver \/ Black","offer_id":54662350537070,"sku":"BACRHUEXT14aSLVBLK","price":9400.0,"currency_code":"USD","in_stock":true},{"title":"Silver \/ Red","offer_id":54662350569838,"sku":"BACRHUEXT14aSLVRED","price":9700.0,"currency_code":"USD","in_stock":true},{"title":"Silver \/ Blue","offer_id":54662350602606,"sku":"BACRHUEXT14aSLVBLU","price":9700.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Black","offer_id":54662350635374,"sku":"BACRHUEXT14aBLKBLK","price":9400.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Red","offer_id":54662350668142,"sku":"BACRHUEXT14aBLKRED","price":9700.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Blue","offer_id":54662350700910,"sku":"BACRHUEXT14aBLKBLU","price":9700.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/1537\/4703\/files\/backert-labs-rhumba-extreme-1-4a-linestage-tube-preamp.webp?v=1787838663"},{"product_id":"backert-labs-rhumba-1-4a-audiophile-stereo-tube-preamp","title":"Backert Labs Rhumba 1.4a Audiophile Stereo Tube Preamp","description":"\u003c!-- ======================================================\n     Backert Labs Rhumba 1.4a Preamp — AL (bh-*) HTML\n     Two-Column Layout (Overview left \/ Specifications right)\n     Long-tail keyword used 5×: “Backert Labs Rhumba 1.4a Preamp”\n     ====================================================== --\u003e\n\u003cstyle\u003e\n  .bh-wrap{max-width:1100px;margin:0 auto;padding:1rem 1.25rem;line-height:1.6}\n  .bh-title{font-size:3rem;margin:.25rem 0 1rem}\n  .bh-sub{font-style:italic;margin:0 0 1.25rem}\n  .bh-grid{display:grid;gap:1.25rem}\n  @media(min-width:900px){.bh-grid{grid-template-columns:1.3fr .7fr;align-items:start}}\n  .bh-section{margin:2rem 0}\n  .bh-section h2{margin-top:0}\n  .bh-bullets{list-style:disc;padding-left:1.25rem;margin:.5rem 0 0}\n  .bh-specs{width:100%;border-collapse:collapse}\n  .bh-specs th,.bh-specs td{border:1px solid #e5e7eb;padding:.65rem;vertical-align:top}\n  .bh-specs th{width:42%;background:#f8fafc;text-align:left}\n  .bh-badge{display:inline-block;border:1px solid #e5e7eb;border-radius:999px;padding:.2rem .6rem;margin:.15rem .3rem 0 0;font-size:.85rem}\n  .bh-badges{margin-top:.5rem}\n  .bh-faq details{border:1px solid #e5e7eb;border-radius:.5rem;padding:.75rem 1rem;margin:.5rem 0;background:#fafafa}\n  .bh-faq summary{font-weight:600;cursor:pointer}\n  .bh-note{font-size:.95rem;opacity:.9}\n  .bh-condition{display:inline-block;border:1px solid #e5e7eb;border-radius:999px;padding:.3rem .75rem;margin:.5rem 0 0;font-size:.85rem}\n\u003c\/style\u003e\n\u003cdiv class=\"bh-wrap\" itemscope=\"\" itemtype=\"https:\/\/schema.org\/Product\"\u003e\n\u003ch1 class=\"bh-title\" itemprop=\"name\"\u003eBackert Labs Rhumba 1.4a Preamp\u003c\/h1\u003e\n\u003cp class=\"bh-sub\"\u003eReference line-stage vacuum tube preamplifier • GreenForce™ proprietary power supply with PTFE Teflon® capacitors • dual 12AU7 \/ ECC82 tube gain stage with easy-access top hatch • fully balanced XLR and single-ended RCA inputs and outputs • motorized remote volume control with home theater bypass • handcrafted in Pennsylvania, USA\u003c\/p\u003e\nThe \u003cstrong\u003eBackert Labs Rhumba 1.4a Preamp\u003c\/strong\u003e delivers breathtaking holographic soundstaging, lightning-fast transient dynamics, and organic midrange bloom in an all-analog reference tube line stage. Re-engineered with Backert Labs’ patented GreenForce power supply topology—which eschews electrolytic storage capacitors in favor of ultra-fast film and PTFE Teflon capacitors—this preamplifier addresses traditional tube sluggishness by supplying virtually instantaneous current to its dual 12AU7 dual-triode gain block. Offering both true balanced XLR and single-ended RCA connectivity, a convenient tool-less top-panel tube access door for effortless tube rolling, precision motorized volume attenuation, and an ultra-low output impedance, it integrates harmoniously with virtually any tube or solid-state power amplifier on the market.\n\u003cdiv class=\"bh-grid\"\u003e\n\u003cdiv\u003e\n\u003csection id=\"features-and-tech\" class=\"bh-section\"\u003e\n\u003ch2\u003eKey Features \u0026amp; Innovations\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented GreenForce™ Power Supply Topology\u003c\/strong\u003e — the \u003cstrong\u003eBackert Labs Rhumba 1.4a Preamp\u003c\/strong\u003e eliminates conventional electrolytic reservoir capacitors entirely, substituting high-speed polypropylene and premium PTFE Teflon caps that recharge at microsecond speed to produce visceral, pitch-perfect bass transients and an ink-black background.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual 12AU7 \/ ECC82 Pure Triode Line Stage\u003c\/strong\u003e — employs a minimalist, low-distortion dual-triode amplification topology that imparts natural harmonic texture and three-dimensional stage depth without adding syrupy coloration or blurring micro-detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Easy-Access Top Tube Door\u003c\/strong\u003e — features a magnetically secured, slotted aluminum top hatch that allows listeners to change or audition new-old-stock (NOS) and premium vacuum tubes by hand in seconds without disassembling the chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Balanced XLR \u0026amp; Single-Ended Architecture\u003c\/strong\u003e — provides balanced XLR inputs and outputs alongside gold-plated RCA terminals, matched with an ultra-low output impedance (~75 ohms) that permits long interconnect cable runs without high-frequency rolloff.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotorized Alps Attenuation \u0026amp; Home Theater Bypass\u003c\/strong\u003e — equipped with a smooth motorized analog volume control operated via the included solid aluminum remote, paired with a dedicated unity-gain HT bypass input for effortless integration into surround sound systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection id=\"faq\" class=\"bh-section bh-faq\"\u003e\n\u003ch2\u003eFAQ — Backert Labs Rhumba 1.4a\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat makes the GreenForce power supply in the Backert Labs Rhumba 1.4a Preamp unique?\u003c\/summary\u003e\n\u003cp\u003eUnlike standard preamplifiers that rely on slow-releasing electrolytic filter capacitors, the \u003cstrong\u003eBackert Labs Rhumba 1.4a Preamp\u003c\/strong\u003e utilizes the patented GreenForce active power supply with PTFE Teflon caps, enabling instantaneous power delivery that yields the rhythmic attack of top-tier solid state alongside the harmonic warmth of pure triodes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the Rhumba 1.4a have a built-in phono stage?\u003c\/summary\u003e\n\u003cp\u003eNo. The Rhumba 1.4a is a dedicated high-performance analog line-stage preamplifier; turntable sources connect via an external outboard phono preamplifier into any of its available RCA or XLR line-level inputs.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I roll different vacuum tube types in this preamplifier?\u003c\/summary\u003e\n\u003cp\u003eYes. The circuit is optimized for 12AU7 \/ ECC82 tubes and compatible 12V dual-triode variants (such as 5814, 5963, and ECC802S), made exceptionally easy thanks to the tool-less top-panel access hatch.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow well does it mate with solid-state power amplifiers?\u003c\/summary\u003e\n\u003cp\u003eExceptionally well. Thanks to an unusually low output impedance of approximately 75 ohms across the audio spectrum, the Rhumba 1.4a can drive solid-state amplifiers with difficult input impedances without bass attenuation or impedance-mismatch issues.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection id=\"why-buy\" class=\"bh-section\"\u003e\n\u003ch2\u003eWhy Buy From Us\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eAuthorized Backert Labs reference dealer offering 100% factory-authentic electronics with full manufacturer warranty protection\u003c\/li\u003e\n\u003cli\u003eExperienced tube audio specialists available to guide amplifier synergy, tube-rolling options, and cable matching\u003c\/li\u003e\n\u003cli\u003eDedicated post-purchase technical support for bias monitoring, system burn-in, and home theater bypass setup\u003c\/li\u003e\n\u003cli\u003ePrompt, fully insured priority shipping in heavy-duty reinforced packaging on every order\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection id=\"related\" class=\"bh-section\"\u003e\n\u003ch2\u003eRelated \u0026amp; System Matches\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eParasound Halo JC 5 or Parasound JCM250 high-current power amplifiers\u003c\/li\u003e\n\u003cli\u003eRogue Audio stereo and monoblock vacuum tube power amplifiers\u003c\/li\u003e\n\u003cli\u003eBenchmark DAC3 L and HiFi Rose RS130 reference digital audio transports\u003c\/li\u003e\n\u003cli\u003eAudioQuest balanced XLR interconnects and high-purity AC power cables\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c!-- RIGHT COLUMN --\u003e\n\u003caside\u003e\n\u003csection id=\"specs\" class=\"bh-section\"\u003e\n\u003ch2\u003eRhumba 1.4a Specs\u003c\/h2\u003e\n\u003ctable class=\"bh-specs\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eVacuum Tube Line-Stage Preamplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube Complement\u003c\/th\u003e\n\u003ctd\u003e2x 12AU7 \/ ECC82 Dual Triodes (Factory Tested \u0026amp; Matched)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Supply Design\u003c\/th\u003e\n\u003ctd\u003ePatented GreenForce™ Power Supply with PTFE Teflon® Capacitors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e1.5 Hz – 320,000 Hz (+0 dB, -3 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGain\u003c\/th\u003e\n\u003ctd\u003e9 dB or 11 dB (Internally Configurable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTotal Harmonic Distortion (THD)\u003c\/th\u003e\n\u003ctd\u003e\u0026lt; 0.05% at 2V Output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-to-Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e\u0026gt; 98 dB (A-weighted, ref. 2V out)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Impedance\u003c\/th\u003e\n\u003ctd\u003eApprox. 75 Ohms (Balanced XLR and Unbalanced RCA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAnalog Inputs\u003c\/th\u003e\n\u003ctd\u003e3x Line RCA, 1x Balanced XLR, 1x Home Theater Bypass (RCA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAnalog Outputs\u003c\/th\u003e\n\u003ctd\u003e2x Line RCA Pre-Out, 1x Balanced XLR Pre-Out\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVolume Attenuator\u003c\/th\u003e\n\u003ctd\u003eMotorized Precision Alps Analog Potentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChassis Top Door\u003c\/th\u003e\n\u003ctd\u003eSlotted Magnetic Easy-Access Tube Access Hatch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish Options\u003c\/th\u003e\n\u003ctd\u003eBrushed Black Anodized Faceplate or Natural Silver Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions (W x H x D)\u003c\/th\u003e\n\u003ctd\u003e17.0\" x 4.5\" x 12.0\" (432 x 114 x 305 mm) including knobs \u0026amp; jacks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNet Weight\u003c\/th\u003e\n\u003ctd\u003e17.0 lbs (7.7 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"bh-note\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection id=\"whats-in-the-box\" class=\"bh-section\"\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eBackert Labs Rhumba 1.4a Preamp chassis\u003c\/li\u003e\n\u003cli\u003eFactory-tested, matched pair of 12AU7 vacuum tubes\u003c\/li\u003e\n\u003cli\u003eSolid aluminum handheld infrared remote control\u003c\/li\u003e\n\u003cli\u003eHeavy-duty detachable IEC AC power cord\u003c\/li\u003e\n\u003cli\u003eOwner's manual and factory warranty certificate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c!-- No purchase\/CTA section --\u003e\u003c\/aside\u003e\n\u003c\/div\u003e\n\u003cmeta itemprop=\"brand\" content=\"Backert Labs\"\u003e \u003cmeta itemprop=\"category\" content=\"Preamplifiers, Tube Preamplifiers, Line Stage Preamps, High-End Audio Electronics\"\u003e\n\u003c\/div\u003e","brand":"Backert Labs","offers":[{"title":"Silver \/ Black","offer_id":54662519456110,"sku":"BACRHUMBA14aSLVBLK","price":5800.0,"currency_code":"USD","in_stock":true},{"title":"Silver \/ Red","offer_id":54662519488878,"sku":"BACRHUMBA14aSLVRED","price":6100.0,"currency_code":"USD","in_stock":true},{"title":"Silver \/ Blue","offer_id":54662519521646,"sku":"BACRHUMBA14aSLVBLU","price":6100.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Black","offer_id":54662519554414,"sku":"BACRHUMBA14aBLKBLK","price":5800.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Red","offer_id":54662519587182,"sku":"BACRHUMBA14aBLKRED","price":6100.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ Blue","offer_id":54662519619950,"sku":"BACRHUMBA14aBLKBLU","price":6100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/1537\/4703\/files\/backert-labs-rhumba-1-4-preamp7.webp?v=1784915208"},{"product_id":"backert-labs-rhythm-1-4a-preamplifier","title":"Backert Labs Rhythm 1.4a Preamplifier","description":"\u003c!-- ======================================================\nBackert Labs Rhythm 1.4a Preamplifier\nSEO-Optimized Shopify Product Page\n\nCURRENT 1.4a VERSION\nOverview Paragraphs: 2\nHighlights \u0026 Benefits: 5\nTechnology \u0026 Design: 4\nFAQ: 4\nRelated Products \u0026 Accessories: 4\nSpecifications: Scroll-Free CSS Grid\nBuilt-to-Order Note Included\nPricing \/ MSRP Removed\nDuplicate Product Microdata Removed\n====================================================== --\u003e\n\u003cstyle\u003e\n.bh-wrap,\n.bh-wrap *,\n.bh-wrap *::before,\n.bh-wrap *::after{\n  box-sizing:border-box;\n}\n\n.bh-wrap{\n  width:100%;\n  max-width:1100px;\n  margin:0 auto;\n  padding:1rem 1.25rem;\n  line-height:1.6;\n}\n\n.bh-eyebrow{\n  display:block;\n  margin:0;\n  letter-spacing:.08em;\n  text-transform:uppercase;\n  font-size:.8rem;\n  opacity:.7;\n}\n\n.bh-title{\n  margin:.25rem 0 1rem;\n  font-size:2.75rem;\n  font-weight:700;\n  line-height:1.2;\n  overflow-wrap:normal;\n  word-break:normal;\n}\n\n.bh-intro{\n  margin:0 0 1.25rem;\n  font-style:italic;\n}\n\n.bh-order-note{\n  margin:1rem 0 1.5rem;\n  padding:1rem 1.1rem;\n  border:1px solid #d1d5db;\n  border-radius:.5rem;\n  background:#f8fafc;\n}\n\n.bh-order-note strong{\n  font-weight:700;\n}\n\n.bh-grid{\n  display:grid;\n  grid-template-columns:minmax(0,1fr);\n  gap:2rem;\n  width:100%;\n  max-width:100%;\n}\n\n.bh-main,\n.bh-side{\n  display:block;\n  width:100%;\n  min-width:0;\n  max-width:100%;\n  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min-width:0;\n  padding:.58rem;\n  border-right:1px solid #e5e7eb;\n  border-bottom:1px solid #e5e7eb;\n  font-size:.86rem;\n  line-height:1.4;\n  white-space:normal;\n  overflow-wrap:anywhere;\n  word-break:normal;\n  overflow:visible;\n}\n\n.bh-spec-label{\n  background:#f8fafc;\n  font-weight:600;\n}\n\n.bh-faq details{\n  margin:.5rem 0;\n  padding:.75rem 1rem;\n  border:1px solid #e5e7eb;\n  border-radius:.5rem;\n  background:#fafafa;\n}\n\n.bh-faq summary{\n  font-weight:600;\n  cursor:pointer;\n}\n\n@media(max-width:899px){\n  .bh-wrap{\n    padding:.75rem 1rem;\n  }\n\n  .bh-title{\n    font-size:2.1rem;\n  }\n\n  .bh-grid{\n    gap:.5rem;\n  }\n}\n\n@media(max-width:480px){\n  .bh-title{\n    font-size:1.8rem;\n  }\n\n  .bh-spec-row{\n    grid-template-columns:minmax(0,40%) minmax(0,60%);\n  }\n\n  .bh-spec-label,\n  .bh-spec-value{\n    padding:.48rem;\n    font-size:.8rem;\n  }\n}\n\u003c\/style\u003e\n\u003cdiv class=\"bh-wrap\"\u003e\n\u003cspan class=\"bh-eyebrow\"\u003eBackert Labs\u003c\/span\u003e\n\u003ch1 class=\"bh-title\"\u003eBackert Labs Rhythm 1.4a Preamplifier\u003c\/h1\u003e\n\u003cp class=\"bh-intro\"\u003eFlagship Class A Tube Linestage • New 1.4a Pure Silver Wiring • New Chassis Ground Technology • Revised Circuit Board Layouts • Patented GreenForce Power Supply • Dual-Mono Transformer Windings • Fluoropolymer Power-Supply Capacitors • Fully Balanced XLR Connectivity • Two 12AU7-Family Tubes • IsoAcoustics Gaia Feet\u003c\/p\u003e\n\u003cdiv class=\"bh-order-note\"\u003e\n\u003cstrong\u003eBuilt to Order:\u003c\/strong\u003e The Backert Labs Rhythm 1.4a is built to order. Typical lead time is approximately \u003cstrong\u003e10–14 business days\u003c\/strong\u003e before shipment.\u003c\/div\u003e\n\u003cdiv class=\"bh-grid\"\u003e\n\u003c!-- LEFT COLUMN --\u003e\n\u003cdiv class=\"bh-main\"\u003e\n\u003csection class=\"bh-section\" id=\"overview\"\u003e\n\u003ch2\u003eBackert Labs Rhythm 1.4a — Flagship Tube Linestage Performance\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBackert Labs Rhythm 1.4a Preamplifier\u003c\/strong\u003e is the flagship expression of Backert Labs' approach to high-performance tube linestage design. Building on the Rhythm 1.4 platform, the new 1.4a adds pure silver wire in select areas, new chassis-ground technology and redesigned circuit-board layouts intended to further improve clarity, texture and stereo imaging while retaining the advanced GreenForce power supply, proprietary Class A gain stage and premium mechanical construction of the established Rhythm.\u003c\/p\u003e\n\u003cp\u003eTwo carefully selected 12AU7-family tubes operate within a zero-negative-feedback signal path supported by a power supply engineered specifically for speed, low noise and dynamic accuracy. Fully balanced XLR connectivity, dual-mono transformer windings, fluoropolymer power-supply capacitors, a solid-brass circuit-board support panel, IsoAcoustics Gaia feet, automatic tube bias and an all-machined aluminum chassis make the Rhythm 1.4a Backert Labs' most ambitious linestage for reference-level two-channel systems.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"highlights\"\u003e\n\u003ch2\u003eHighlights \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew 1.4a Pure Silver Wiring\u003c\/strong\u003e — Pure silver wire is used in select areas to improve clarity, musical texture and low-level resolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew Chassis Ground Technology\u003c\/strong\u003e — The 1.4a revision incorporates new grounding technology designed to further refine signal integrity and background quietness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRevised 1.4a Circuit Board Layouts\u003c\/strong\u003e — New circuit-board layouts are specifically intended to improve stereo imaging and spatial presentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlagship GreenForce Power Supply\u003c\/strong\u003e — Backert Labs' patented supply architecture allows premium fluoropolymer capacitors to be used in the raw B+ supply for fast transient response and exceptional dynamic capability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Mono Architecture\u003c\/strong\u003e — Separate transformer windings for the left and right channels preserve channel separation through the power supply for a wide, dimensional soundstage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"technology\"\u003e\n\u003ch2\u003eTechnology \u0026amp; Design\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe 1.4a Evolution\u003c\/strong\u003e — The \u003cstrong\u003eBackert Labs Rhythm 1.4a Preamplifier\u003c\/strong\u003e retains the core engineering of the Rhythm 1.4 while introducing the newest Backert Labs refinements. Pure silver wire is incorporated in select locations to improve clarity and texture, revised chassis-ground technology addresses grounding behavior, and newly developed circuit-board layouts are intended to further improve imaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePatented GreenForce Power Supply\u003c\/strong\u003e — Rhythm uses Backert Labs' GreenForce architecture to actively regulate and deliver power to the gain stage. Its flagship implementation incorporates premium fluoropolymer capacitors in the raw B+ supply, an unusual approach made possible by the GreenForce design and selected for its speed, low dielectric absorption and transient performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClass A Gain Stage with Automatic Bias\u003c\/strong\u003e — Two 12AU7 or equivalent tubes operate at exceptionally low voltage within Backert Labs' proprietary Class A gain circuit. The design uses zero global or local negative feedback, while automatic and continuous tube-bias adjustment maintains appropriate operating conditions throughout the tubes' service life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReference Mechanical Construction\u003c\/strong\u003e — The Rhythm chassis is machined from solid aluminum and uses a solid-brass bottom panel to support the circuit board. IsoAcoustics Gaia feet provide mechanical isolation, while a top-mounted acrylic tube door allows the two tubes to be changed without tools.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section bh-faq\" id=\"faq\"\u003e\n\u003ch2\u003eFAQ — Backert Labs Rhythm 1.4a\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is new about the Rhythm 1.4a?\u003c\/summary\u003e\n\u003cp\u003eThe Rhythm 1.4a adds three principal improvements to the 1.4 platform: pure silver wire in select areas for improved clarity and texture, new chassis-ground technology, and new circuit-board layouts designed to improve imaging.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the Rhythm 1.4a built to order?\u003c\/summary\u003e\n\u003cp\u003eYes. This \u003cstrong\u003eBackert Labs Rhythm 1.4a Preamplifier\u003c\/strong\u003e is built to order. Typical lead time is approximately 10–14 business days before shipment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many tubes does the Rhythm 1.4a use?\u003c\/summary\u003e\n\u003cp\u003eThe Rhythm 1.4a uses only two 12AU7 or equivalent tubes. Backert Labs selects its stock tubes for low noise and musical performance, while automatic bias helps maintain appropriate operating conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the Rhythm 1.4a be integrated into a home theater system?\u003c\/summary\u003e\n\u003cp\u003eYes. A dedicated RCA Home Theater Bypass input passes the front-channel signal from a compatible processor or A\/V receiver without requiring the Rhythm to be powered on, so its tubes do not need to remain energized during home theater playback.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"why-buy\"\u003e\n\u003ch2\u003eWhy Buy From Us\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eAuthorized Backert Labs Dealer\u003c\/li\u003e\n\u003cli\u003e5% Reward Points on Every Purchase\u003c\/li\u003e\n\u003cli\u003ePrice Match Guarantee\u003c\/li\u003e\n\u003cli\u003eExpert Tube, Power Amplifier and Reference Two-Channel System Matching Support\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"related\"\u003e\n\u003ch2\u003eRelated Backert Labs Products\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003eBackert Labs Rhumba Extreme 1.4a Linestage Tube Preamp\u003c\/li\u003e\n\u003cli\u003eBackert Labs Rhumba 1.4a Preamp\u003c\/li\u003e\n\u003cli\u003eBackert Labs Rhumba XPhono 1.1 Tube Phono Preamplifier\u003c\/li\u003e\n\u003cli\u003eBackert Labs Optik 1.1 Phono Equalizer for DS Audio Cartridges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c!-- RIGHT COLUMN --\u003e\n\u003cdiv class=\"bh-side\"\u003e\n\u003csection class=\"bh-section\" id=\"specs\"\u003e\n\u003ch2\u003eBackert Labs Rhythm 1.4a Specifications\u003c\/h2\u003e\n\u003cdiv class=\"bh-specs\" role=\"table\"\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eProduct Type\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eFlagship vacuum-tube linestage preamplifier\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eModel\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eRhythm 1.4a\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Silver-Wire Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePure silver wire used in select areas\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Grounding Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eNew chassis-ground technology\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003e1.4a Circuit Board Upgrade\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eNew circuit-board layouts designed for improved imaging\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eAmplification\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eClass A tube linestage\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eNegative Feedback\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eZero global or local negative feedback\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Complement\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × 12AU7 or equivalent tubes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Bias\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eAutomatic and continuously adjusted\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eGain\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e10dB\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eFrequency Response\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e6Hz–108kHz, within 1.5dB\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTHD + Noise\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e0.09%\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eSignal-to-Noise Ratio\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e98dB; 90dB referenced to 1V output\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eInput Impedance\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e34k ohms\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eOutput Impedance\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBelow 80 ohms\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eCrosstalk\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e78dB\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTotal Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e5 stereo input pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBalanced Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × fully balanced stereo XLR pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRCA Inputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e3 × stereo RCA pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBalanced Outputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × fully balanced stereo XLR pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRCA Outputs\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e2 × stereo RCA pairs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eREC OUT\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e1 × stereo RCA pair, fixed output\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eHome Theater Bypass\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e1 × RCA input pair; does not require preamp power\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eFront-Panel Controls\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBalance, mute, mono\/stereo, input selector and volume\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eVolume Control\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eAnalog volume control with remote operation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003ePower Supply\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePatented Backert Labs GreenForce power supply\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003ePower-Supply Capacitors\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003ePremium fluoropolymer capacitors in raw B+ supply\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003ePower Transformer\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eCustom toroidal transformer\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTransformer Architecture\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eSeparate windings for left and right channels\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eIEC Power Inlet\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eFurutech IEC connector\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eChassis\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eMachined solid-aluminum construction\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eCircuit Board Support\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eSolid-brass bottom panel\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eIsolation Feet\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eIsoAcoustics Gaia feet\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTube Access\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eTop-mounted acrylic tube-access door\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eVolume Indicator\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eSubtle LED on volume knob\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eRemote Control\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eHeavy metal handset with volume up\/down and mute\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eChassis Finish\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eEntire chassis available in Black or Silver\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eDimensions\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e17 × 14 × 5 in.\u003cbr\u003eW × D × H\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eWeight\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e29 lbs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eIdle Power Consumption\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003e31 watts\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eManufacturing\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eDesigned, machined and assembled in Pennsylvania, USA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBuilt to Order\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eYes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eTypical Lead Time\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eApproximately 10–14 business days\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eQuantity\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eEach\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-row\" role=\"row\"\u003e\n\u003cdiv class=\"bh-spec-label\" role=\"rowheader\"\u003eBrand\u003c\/div\u003e\n\u003cdiv class=\"bh-spec-value\" role=\"cell\"\u003eBackert Labs\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"bh-section\" id=\"whats-in-the-box\"\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul class=\"bh-bullets\"\u003e\n\u003cli\u003e1 × Backert Labs Rhythm 1.4a Preamplifier\u003c\/li\u003e\n\u003cli\u003e2 × Selected 12AU7-Family Tubes, Installed\u003c\/li\u003e\n\u003cli\u003e1 × Heavy Metal Remote Handset\u003c\/li\u003e\n\u003cli\u003e1 × Acrylic Tube Access Door, Installed\u003c\/li\u003e\n\u003cli\u003e1 × Set of IsoAcoustics Gaia Isolation Feet, Installed\u003c\/li\u003e\n\u003cli\u003e1 × AC Power Cord\u003c\/li\u003e\n\u003cli\u003eOwner's Documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePower amplifier, source components, interconnect cables, loudspeakers and other system components are sold separately.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Backert Labs","offers":[{"title":"Silver","offer_id":54662699286894,"sku":"BACRHYTHM14aSLV","price":14500.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":54662699319662,"sku":"BACRHYTHM14aBLK","price":14500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/1537\/4703\/files\/backert-labs-rhythm-1-4-preamplifier.webp?v=1785158870"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/1537\/4703\/collections\/Backert_Labs_Stereo_Pre-Amps.webp?v=1794339948","url":"https:\/\/audiolab.com\/collections\/backert-labs-stereo-pre-amps.oembed","provider":"Audiolab","version":"1.0","type":"link"}