Audio Research D-150 Classic Tube Amplifier - Holy Grail and in the Top 3 of All Time


*Special Note - if you own one of these rare pieces of history and want to learn more about selling it or are interested in trading it in for something else of interesting value - please contact us directly*

The D-150 is regarded by many as The Ultimate Classic Amplifier

Rated in the 2012 "Absolute Sound Guide to Audio Electronics" as the "3rd MOST SIGNIFICANT AMPLIFIER OF ALL TIME", the Audio Research D-150 was the world's first powerful vacuum tube stereo amplifier.  

HP himself commented that because of its unparalleled faithfulness to the sound of real music, the D-150 is one of those rare products that no one ever forgets first hearing. 

The sound quality and output power of the D-150 is not the only thing about it that's rare.  Audio Research built only 200 of these amplifiers, making it one of the most sought after collectables (as well as an amazing amplifier), that still rivals some of the best of today.

Click here for a PDF copy of the original D-150 Sales Brochure

Click here for a PDF copy of the original D-150 Instruction Manual

Click here for a PDF copy of the original D-150 Schematic 


Power Output: 150 Watts per channel minimum RMS, into a 4, 8, or 16 ohm load

Frequency Response: 20Hz to 20kHz 

Distortion: Less than .5% at Rated Power 

Input Impedance: 80K ohms at 20 Hz; 30K ohms at 15k Hz 

Output Impedance: 4, 8, 16 ohms 

Tube Complement: 12AX7, 6FQ7, 6550

Damping Factor: 14 at 8 ohms (1k Hz) 

Input Sensitivity: 2.2 volts for rated output 

Hum & Noise: More than 80db below rated output 

Power Requirements: 100, 110, 120, 220, or 240 VAC; 50-60 Hz 

Dimensions: Front Panel 19" Wide X 10.5" High, Chassis 16.5" Deep 

Weight: 115 lbs.

Year: 1975

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