ARC D-51
Almost nothing is documented about the ARC D-51. Even its product category is uncertain. The Archive lists it under synths, but the only period references place it with high-end audio components, alongside other ARC models such as the D-75-A-G and D-52. A classified listing in Audio (January 1982, p.79) offered a D-51 described as “(N) good cond w/carton $495.” That one data point is about all that survives: a price of $495 in 1982, from a seller moving ARC equipment.
No specifications, design details, production years, original manual or circuit information have been located. Nobody knows whether the D-51 was a power amplifier, a preamplifier, or something else. The “D” prefix suggests it may have belonged to ARC’s power amplifier line, but that is conjecture. The unit appears to have been uncommon even in its own time, and no user reviews, contemporary tests or service documentation are known to exist.
A second classified mention in Audio (October 1981, p.150) grouped “A.R.C. EQUIPMENT FOR SALE” without listing the D-51 by name. It confirms only that ARC gear was changing hands in that period.
Known facts:
- Brand: ARC (likely Audio Research Corporation, though not confirmed in source materials)
- Model: D-51
- Listed for sale as used equipment at $495 (January 1982)
- Described as “(N)” — condition code unclear, but offered “with carton”
- No technical specifications, dimensions, weight, or performance data recorded
- No production years or original retail price established
If you own a D-51, have a manual, or have any documentation, even a single specification or a photograph, the Archive would welcome a contribution.
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