Audio Research D-1
Little is documented about the Audio Research D-1 from factory literature or period press, though a classified ad in Audio (February 1980, p.98) lists other Audio Research models. What the record shows comes mainly from enthusiast forums and a single hifi-wiki entry. It is a solid-state phono preamplifier, and it takes both moving coil and moving magnet cartridges. The MC input is a separate card with physical adjustment points. Input impedance is 47kΩ. Gain measures 65dB in the MC position and 40dB in the MM position. Frequency response follows RIAA within ±0.5dB. Signal-to-noise is specified at 70dB (weighted) and 67dB (unweighted).
User reports describe the sound as warm, liquid, and unusually three-dimensional. It sits closer to tube gear than most solid-state designs, though not as overtly tubey as a Conrad-Johnson or CAT preamplifier. One user on Audiokarma preferred it to the Audio Research SP-8. A known weakness is leaky electrolytic capacitors in both the power supply and signal path. Owners report that replacing all the small electrolytics, even those that test good, can dramatically improve performance. The D-1 retailed for around $2,500 - $3,000 in the mid-2000s. A mint example with original box sold on eBay in 2013 for $500. Exact production years are not recorded.
Known Specs
- Type: Phono preamplifier
- Circuit: Solid-state
- Input impedance: 47kΩ
- Gain: 65dB (MC), 40dB (MM)
- Frequency response: RIAA ±0.5dB
- S/N ratio: 70dB (weighted), 67dB (unweighted)
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