Audio Research D-79 Tube Amplifier

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Many audiophiles have said that the D-79 is the best amplifier that ARC ever built.

With a massive power supply for its modest 75 watts per channel, the D-79 draws 750 watts from the AC line at full output. This amplifier uses a matched pair of 6550 output tubes per side with an additional 6550 as a voltage regulator.

There were 3 versions made over the years and by far, the original, as seen here, has the warmest dynamics as it uses 12AX7 tubes in the input stage. It is a very warm and rich amplifier so if you’re looking for super dry and analytical reproduction look elsewhere. The soundstage is big and wide and works well with Jazz and Vocals.

This particular sample is as clean as your likely to find. It came to us from the personal collection of a famous speaker maker from the 70’s and I believe this was his reference amplifier used in the design of many speakers, in conjunction with the SP3 tube preamp also listed on our site.

The meters look and operate perfectly. The faceplate is free from any discoloration or scratches. All knobs and switches work as they should and the metal work is free from any rust or dents. Really a beautiful looking specimen.

The industrial design is not for all, but I love the look of it and so do the designers of the latest series from ARC as their top of the line current amplifier is a throwback to this industrial design in both look and feel.

I have gone through this amplifier thoroughly and made sure it’s working to spec.

To put the cherry on top I installed a super rare and original brand new set of ARC Russian 6550 tubes. These tubes came in original ARC packaging and were matched at the factory in pair. What a rare treat!

Included is the original D-79 manual, well preserved, which contains full schematics.

Amplifier will be double boxed in a McIntosh double carton (well known for building heavy amplifiers) which should ensure safe arrival.

This is a rare and original amplifier in near perfect condition and is priced accordingly. No lowball offers please. If this price doesn’t suit your budget you should consider the solid state D-110 version which looks identical but uses transistors instead of tubes.