Audio Research D-75
A tube power amplifier from Audio Research, used in high-end audio systems in the early 1970s.
Overview
The Audio Research D-75 is a tube power amplifier produced by Audio Research, a company known for its high-fidelity audio equipment. Though specific production years are not documented, the amplifier was in use by audiophiles by 1972. It was paired with high-end speakers of the era, including the Dahlquist DQ-10 and Magneplanar Tympani T-I, often in bi-amped configurations with other Audio Research power amplifiers like the D-51. The D-75 was used with the SP-2 preamplifier in complete Audio Research systems.
Specifications
| Original Price | $550 (Audio-1976-01.pdf) or $730 (Audio-1982-01.pdf) |
Market
A classified ad from 1978 lists an Audio Research D-75 in excellent condition with new tubes for $600. As of a later forum post, a user was offered a recently serviced and operational D-75 for $1,000, indicating continued collector interest. Owner discussions include technical maintenance, such as how to bias the amplifier, suggesting ongoing use and serviceability.
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Related Models
- Audio Research D-76
- Audio Research D-79
- Audio Research D79B
- Audio Research S-100
- Audio Research D-51
- Luxman L-530 (1975)
- Luxman R-404 (1975)
- Luxman RV-371 (1975)
- Luxman SQ-38U (1975)
- Luxman T-14 (1972)