Rogue Audio Atlas Dark Power Amplifier

A Hundred Watts of Tube Power, and a Switch

The Rogue Audio Atlas Dark is a stereo tube power amplifier making 100 watts per channel. It takes the line-level signal from your preamp and turns it into something your speakers can use, which is the only job it has and the reason it does it well.

A switch on the chassis picks between two ways of running the output tubes. Ultralinear gives you the full power, the firmer bass and the harder hitting dynamics. Triode trades some of that for a smoother, more relaxed reading that suits voices and small acoustic groups.

Not a Soft-Sounding Tube Amp

A large linear power supply sits behind those 100 watts, holding the energy needed for deep bass, sharp attacks and sudden swings in level. This is a tube amplifier you can play rock and orchestral music through at a real volume without it running out of composure.

What the Dark Version Changes

The Dark takes the standard Atlas and improves the parts that decide how quiet and how clear it is. Power-supply capacitance goes up by 25%, which stores more energy for dynamics and bass control, and Hexfred fast-acting diodes cut the switching noise the supply makes.

The Parts in the Signal Path

Psvane Art Series tubes handle the input and driver stages, a 12AX7 and a 12AU7. Coupling capacitors are upgraded to hold on to fine detail as the signal passes through, and premium capacitors and PRP resistors sit at the points in the circuit where they matter most.

Cardas rhodium binding posts take the speaker cable, gold-plated RCA jacks take the input, and the power cord detaches so you can change it later. The faceplate is the all-black one that gives this version its name.

Short signal paths and a heavy two-ounce copper circuit board keep the noise floor low. Slow-start sequencing brings the amplifier up gently at switch-on, which is easier on the tubes. Separate 4-ohm and 8-ohm taps let you match it properly to your speakers.

Rogue Audio designs and hand-builds the Atlas Dark in Pennsylvania, then tests it, burns it in and listens to it before it ships. The warranty runs three years on parts and six months on the vacuum tubes.

Who Is This Power Amplifier Best For?

• You want tube sound without the usual power ceiling — 100 watts a channel means a normal pair of floorstanders plays loudly and cleanly instead of running out of headroom.
• You listen to more than one kind of music — the Ultralinear and Triode switch changes the amplifier's character in a second, so one box suits both a rock record and a string quartet.
• Your speakers are a known quantity — separate 4-ohm and 8-ohm taps let you match the output transformer to the load rather than hoping one setting fits.
• You want it repaired rather than replaced — hand-built in Pennsylvania and covered for three years, with the tubes themselves warranted for six months.
• The Atlas Dark is a power amplifier — there is a single pair of RCA inputs and no volume control, so it needs a preamp in front of it. Choose one from our preamplifiers.

How Does It Connect to Your System?

Run a pair of RCA interconnects from your preamplifier to the gold-plated inputs on the back. Speaker cable goes to the Cardas rhodium binding posts, using the 4-ohm or 8-ohm tap that matches your speakers.

The power cord detaches, so you can change it if you want to. Switch between Ultralinear and Triode on the chassis, and give the slow-start circuit a moment to bring everything up at power-on.

Pairs Well With

Building your system? Here are some great companions:

• Preamplifier: The Atlas Dark needs one in front of it — see our Preamplifiers.
• Speakers: 100 watts of tube power drives a serious pair — browse our Floorstanding Speakers.
• Cables: Speaker cable for the Cardas posts — see our Speaker Cables.
• Power Cable: The cord detaches, so it is easy to upgrade — see our Power Cables.

Frequently Asked Questions

How much power does it deliver?

100 watts per channel in Ultralinear mode, from a stereo tube output stage.

What does the Triode switch do?

It changes how the output tubes are run, giving a smoother, more relaxed sound in place of maximum power and impact.

Which tubes does it use?

Psvane Art Series 12AX7 and 12AU7 tubes in the input and driver stages.

What makes the Dark version different?

25% more power-supply capacitance, Hexfred diodes, Psvane Art Series tubes, upgraded coupling capacitors, Cardas rhodium binding posts, premium capacitors and PRP resistors, and the black faceplate.

How do I match it to my speakers?

Use the 4-ohm or the 8-ohm transformer tap, whichever suits the nominal impedance of your speakers.

What warranty does it carry?

Three years on parts and workmanship, and six months on the vacuum tubes, from the date of purchase.

See It in Action

A look at the Atlas Dark on the shelf and what makes it the Dark:

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Learn More

Want to learn more about tube amplifiers, matching a power amp to your speakers, or building a two-channel system? Visit our Learning Center for guides, tips, and expert advice.