Rogue Audio M-180 "Dark" Monoblock Amplifier - Black - Pair

One Hundred and Eighty Watts of Tube Power

The M-180 is a valve monoblock, and this listing is a pair, so you have both channels. Each chassis makes 180 watts, which is a great deal of power from output tubes and enough to drive speakers most valve amplifiers cannot.

Rogue derived the circuit from its Apollo amplifiers. Four KT88 output tubes work in each chassis, alongside a 12AU7 pair and a 12AX7, and an external switch moves the amplifier between ultralinear and pure triode operation.

That switch is the feature owners use most. Ultralinear gives you the full power and the firmer grip; triode trades some of the watts for a more relaxed, harmonically richer presentation. You can change your mind whenever the music does.

This listing is the M-180 Dark in black, supplied as a matched pair of monoblocks in new or demo condition. Both amplifiers arrive together, so what you receive is a complete stereo system.

Inside the Chassis

What the "Dark" Upgrade Is

Dark is a factory upgrade level, not a color. Rogue offers it across the range and sells the M-180 to M-180 Dark conversion as a paid upgrade, so a Dark pair leaves the factory already carrying premium parts through the power supply and signal path.

Biasing Without the Guesswork

A bias meter is built into each amplifier, so setting the output tubes is a matter of reading a needle rather than owning a multimeter. On a valve amplifier you will use for years, that turns a chore into a two-minute job.

Output Taps and Transformers

Separate 4-ohm and 8-ohm taps are provided on the back, so you match the amplifier to your speaker rather than hoping. The output transformers are ultra-wide bandwidth types and the transformers are mechanically isolated from the chassis.

On the Bench

Frequency response runs 5Hz to 50kHz within 1dB and distortion sits below 0.1% in typical use. Input sensitivity is 1.0V RMS into a 200k-ohm impedance, which is an unusually easy load for any preamp to drive, valve or solid state alike.

What Reviewers Are Saying

Erick Lichte, in Stereophile on January 27, 2010, wrote that "The Rogue M-180 deserves to be at the top of every audiophile's list of amps that deliver high performance in almost every aspect of playback—something I'd say even if they cost $10,000/pair."

He also found the amplifiers "gave me almost all that I expect from and desire in a power amplifier, and at a price I could conceivably afford," noting "higher resolution, better bass, and a more defined stereo image" over the M-150 they replaced.

Who Is This Mono Amplifier Best For?

• Listeners who want tube sound with real power — 180 watts per chassis is well beyond what most valve amplifiers manage, so you can have the tube presentation and still drive a speaker that needs current.
• Anyone who likes to tune the sound — The ultralinear and triode switch lets you change the amplifier's character from the listening seat, so one pair covers two quite different moods without buying anything else.
• Owners of speakers with an awkward impedance — Separate 4-ohm and 8-ohm taps let you match the transformer to the load properly, which matters far more on a valve amplifier than a solid-state one.
• People buying a complete pair — This listing is two amplifiers, so a single order gives you a full stereo system with nothing left to add later.
• Valve amps need biasing and eventual retubing — The built-in meter makes biasing quick, but it is still a job you will do occasionally, and the KT88s will want replacing in time. Rogue covers the amplifier for three years and the tubes for six months. Our Preamplifiers pair naturally with these if you still need a source of level control.

How Does It Connect to Your System?

Feed each amplifier one channel from your preamp on balanced XLR or single-ended RCA, then run speaker cable from the correct impedance tap to the speaker beside it. Use the 4-ohm tap for a 4-ohm speaker and the 8-ohm tap for an 8-ohm one.

Set the ultralinear or triode switch to taste before you settle in, and let the slow-start circuit bring the valves up gently at switch-on. As with any power amplifier, the volume control lives in your preamp rather than on the amplifier itself.

Pairs Well With

A valve monoblock pair needs the right company. Here is what most owners add.

• Preamplifiers — valve or solid state, the 200k input impedance suits both. Browse preamplifiers.
• Balanced interconnects — two runs, one to each amplifier. Browse interconnect cables.
• Speaker cables — short runs from each amp to its speaker. Browse speaker cables.
• Floorstanding speakers — 180 tube watts a side suits full-range designs. Browse floorstanding speakers.

Frequently Asked Questions

How much power does one make?

Each M-180 produces 180 watts. That is per chassis, and this listing is a pair, so each of your two speakers gets its own 180-watt valve amplifier.

Which tubes does it use?

Four KT88 output tubes per chassis, plus two 12AU7s and one 12AX7. Rogue supplies them as matched sets, so a pair of M-180s carries eight KT88s between the two amplifiers. KT120s are available as an optional upgrade from the standard KT88s.

What does the triode switch do?

It changes the output stage between ultralinear and pure triode operation. Ultralinear gives the full rated power and tighter control; triode gives up some power for a warmer, more harmonically rich sound. The switch is on the outside, so you can try both.

Is biasing difficult?

Each amplifier has an integral bias meter, so you read the value straight off the front and adjust. It takes a couple of minutes and needs no test equipment of your own.

How big and heavy is each one?

Each chassis measures 14.5 inches wide by 7 high by 19 deep and weighs 55 pounds, so a pair comes to 110 pounds. A welded-wire tube cage covers the valves.

What warranty does it carry?

Rogue covers a new pair for three years, with six months on the vacuum tubes, to the original owner. Demo and open-box pairs carry a limited warranty instead, so call us at 800-942-0220 and we will confirm what applies. Every M-180 is built in Pennsylvania.

See It in Action

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Learn More

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