Rogue Audio Atlas Magnum III Dark Power Amplifier

$3,995.00
$3,995.00

Available for pickup or local delivery. 1-800-513-8555 for details.

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Rogue Audio

Rogue Audio Atlas Magnum III Dark Power Amplifier

Pure Tube Stereo Power Amplifier • 90 Watts per Channel • Ultralinear / Triode Operation • KT88 Output Tubes • Upgraded Dark Power Supply • Premium Coupling Capacitors • Cardas Rhodium Binding Posts • Hand-Built in Pennsylvania

Rogue Audio Atlas Magnum III Dark for High-Power Tube Amplification

The Rogue Audio Atlas Magnum III Dark Power Amplifier takes the proven Atlas Magnum III platform and adds Rogue Audio’s premium Dark upgrade package for even greater transparency, current delivery and low-level resolution. Its all-tube stereo output stage delivers 90 watts per channel with the current KT88 tube complement, providing enough power for a wide range of bookshelf and floorstanding loudspeakers while preserving the dimensionality, tonal richness and dynamic expression associated with tube amplification.

The Dark version upgrades the power supply, small-signal tubes, coupling capacitors, key resistors and capacitors, speaker terminals and cosmetics over the standard Atlas Magnum III. Selectable Ultralinear and Triode modes allow listeners to choose between maximum impact and output or a smoother, more relaxed triode presentation, while separate 4-ohm and 8-ohm transformer taps make speaker matching straightforward.

Highlights & Benefits

  • Dark Edition Upgrades — Premium signal-path components, power-supply improvements, upgraded small-signal tubes, Cardas rhodium binding posts and a Dark faceplate elevate the Atlas beyond the standard Magnum III.
  • 90 Watts per Channel of Tube Power — Four KT88 output tubes provide substantial real-world output for dynamic music reproduction and demanding loudspeakers.
  • Ultralinear / Triode Switching — Choose Ultralinear mode for maximum power and impact or Triode mode for a smoother, more intimate tube presentation.
  • Separate 4- and 8-Ohm Transformer Taps — Dedicated speaker connections improve compatibility with a wide variety of loudspeaker loads.
  • Hand-Built in Pennsylvania — Each amplifier is assembled, tested, burned in and auditioned by Rogue Audio in the United States.

Technology & Design

Dark High-Storage Linear Power Supply — The Rogue Audio Atlas Magnum III Dark Power Amplifier upgrades the already substantial Atlas power supply with additional premium components and greater energy storage. Rogue’s Dark upgrade is designed to improve transient authority, bass control and dynamic headroom while lowering the noise floor.

Premium Signal-Path Components — Upgraded coupling capacitors, precision resistors and selected capacitors are installed at critical points in the audio circuit. These changes are intended to increase transparency, tonal refinement and resolution while preserving the immediacy of the original Atlas design.

Upgraded Small-Signal Tube Stage — The Dark version receives upgraded 12AX7 input tubes and 12AU7 driver tubes in place of the standard small-signal complement. These tubes feed the quartet of KT88 output tubes through a short, low-noise signal path.

Heavy Copper PCB and Premium Connections — Rogue uses a heavy two-ounce copper circuit board, gold-plated RCA inputs and upgraded Cardas rhodium-plated speaker binding posts. A machined aluminum Dark faceplate and detachable IEC power connection complete the amplifier’s premium construction.

FAQ — Rogue Audio Atlas Magnum III Dark

What is different about the Atlas Magnum III Dark?

The Rogue Audio Atlas Magnum III Dark Power Amplifier adds an upgraded power supply, premium signal tubes, upgraded coupling capacitors, upgraded resistors and capacitors in critical locations, Cardas rhodium binding posts and the Dark faceplate compared with the standard Atlas Magnum III.

What is the difference between Ultralinear and Triode mode?

Ultralinear operation provides greater output power, dynamic impact and loudspeaker control. Triode mode reduces available power but provides a smoother, more relaxed presentation that some listeners prefer for vocals, acoustic music and lower-volume listening.

Does the Atlas Magnum III Dark require a separate preamplifier?

Yes. The Atlas is a dedicated stereo power amplifier and does not include source selection or volume control. It should be connected to a compatible line-stage preamplifier or source component with a variable preamplifier output.

Which output tubes does the current Atlas Magnum III use?

Rogue Audio currently specifies four KT88 output tubes. The amplifier can also operate with certain compatible tube families when properly biased, but tube substitutions should follow Rogue Audio’s recommendations.

Why Buy From Us

  • Authorized Rogue Audio Dealer
  • 5% Reward Points on Every Purchase
  • Price Match Guarantee
  • Expert Tube Selection, Speaker Matching and Two-Channel System Support

Rogue Audio Atlas Magnum III Dark Specifications

Product Type
Stereo vacuum-tube power amplifier
Edition
Atlas Magnum III Dark
Output Power
90 watts per channel with current KT88 tube complement
Amplifier Type
Pure vacuum-tube stereo power amplifier
Operating Modes
Selectable Ultralinear and Triode
Frequency Bandwidth
20Hz–30kHz
Input Tubes
2 × upgraded 12AX7
Driver Tubes
2 × upgraded 12AU7
Output Tubes
4 × KT88
Tube Bias
User-adjustable bias system
Speaker Transformer Taps
Separate 4-ohm and 8-ohm outputs
Audio Inputs
1 × stereo pair of gold-plated RCA inputs
Balanced Inputs
No
Speaker Terminals
Upgraded Cardas rhodium-plated binding posts
Dark Power-Supply Upgrade
Upgraded high-storage linear power supply with premium components
Power-Supply Diodes
Upgraded high-speed HexFred-type rectification as part of Dark upgrade
Coupling Capacitors
Premium upgraded coupling capacitors
Precision Components
Upgraded resistors and capacitors in critical circuit locations
Circuit Board
Heavy 2-ounce copper PCB
Turn-On Circuit
Slow-start sequencing
Faceplate
Machined aluminum Dark faceplate
Finish
Black / Dark
Tube Cage
Optional full tube cage / cover
Power Connection
Detachable IEC power cord
Power Requirements
120V / 240V AC, 50/60Hz depending on market configuration
Dimensions
18 × 17 × 6.75 in.
W × D × H
Weight
Approximately 50 lbs.
Shipping Weight
Approximately 55 lbs.
Manufacturing
Designed and hand-built in Pennsylvania, USA
Factory Testing
Fully tested, burned in and auditioned
Quantity
Each
Brand
Rogue Audio

What's in the Box

  • 1 × Rogue Audio Atlas Magnum III Dark Power Amplifier
  • 2 × Upgraded 12AX7 Input Tubes
  • 2 × Upgraded 12AU7 Driver Tubes
  • 4 × KT88 Output Tubes
  • 1 × Detachable AC Power Cord
  • 1 × Bias Adjustment Tool
  • 1 × Owner's Manual

Preamplifier, source components, loudspeakers, interconnect cables, speaker cables and optional tube cage are sold separately.

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