My first Audiophile preamp and amp was the Counterpoint SA2000 line level pre and the Counterpoint SA 220 in 1990 Loved them both. Never had a problem with the SA 2000 but the SA 220 my L ch MOSFET went and that was that. 🤷♂️.
Counterpoint SA-2000 Hum
I recently purchased a Counterpoint SA-2000 off of ebay and it sounds fantastic. However, it has a hum problem. I used a cheater plug and it reduced but did not completely eliminate the issue.
Per the manual, I should be able to adjust the DC offset, but when I popped the top, I found the unit had already been significantly modded and I suspect the work was done by the old Alta Vista folks.
Looking at their old website, I see most of their mods were completed on this unit. The coupling caps were upgraded, the buffer circuitry was eliminated, the rectifier was changed, some electrolytics were replaced and others upgraded to the Continental oil caps, and 5 pairs of RCAs were upgraded.
As part of those upgrades, the pots to adjust the DC offset were removed. So, what can I try next to eliminate the hum?
Thanks!!!
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