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About the D75
The Audio Research D-75, introduced in 1972, is a landmark vintage tube amplifier known for blending tube warmth with modern clarity and control. It delivers 75 watts per channel into 8 ohms, featuring a frequency response from 15Hz to 30kHz and a total harmonic distortion of 1%. The amplifier uses a valve complement of 4 x 12AX7, 8 x 6FQ7, 2 x 6550, and 1 x 5881 tubes, with a damping factor of 14 and input sensitivity of 1.5V. It supports speaker loads from 4 to 16 ohms and has a signal-to-noise ratio of 80dB. The unit measures 19 x 7 x 12.25 inches and weighs 52 lbs. It remains highly regarded for its dynamic, transparent, and lifelike sound, maintaining a dedicated following among audiophiles and collectors decades after its release.
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