Audio Research40th Anniversary Edition Reference PreampusedAudio Research 40th Anniversary Edition Reference PreampI am the original owner. Recently performed was a complete check-up by Audio Research. All four tubes in the power supply were replaced although only one 6550 was in need of replacement. Tubes in t...10900.00

Audio Research 40th Anniversary Edition Reference Preamp [Expired]


no longer for sale

I am the original owner.

Recently performed was a complete check-up by Audio Research. All four tubes in the power supply were replaced although only one 6550 was in need of replacement. Tubes in the pre-amp unit tested good (1335 hours). In addition a Zener protection mod was added to both channels of the power supply to improve reliability. This is in line with improvements found in the REF 10 pre-amp. A 24-hour burn-in by Audio Research was performed to assure all bench tests were passed.

I have owned several Audio Research pre-amps beginning with the SP-3a in the 1970's.

This pre-amp is a marvel.

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