My recently completed amp has a low buzz thru both speakers, not audible from my listening position, about 7 feet or so away from the speakers. But right up close I can hear the buzz (about 2" away from the speakers). This is buzz that's not affected by the hum pot and is much louder if no source is plugged into the amp and powered, once my quickie is turned on the buzz recedes, to barely auidible. Also if you power off the source, the buzz isn't immediate, the amp will be quiet then the buzz will build up to an audible level. Can someone recommend a quick checklist to try the next time I have the amp on the table? I'm going to isolate the grid chokes incase the buzz is mechanical, and add a ground from the grid chokes back to the ground buss (should've done this during the build, guess I got in a hurry). Any other ideas on what to check? It's not bad, only because I know it's there is there a problem. And the fact that I don't know what's causing it so I can avoid it in the future.
Oh yeah, the amp is the one in my other thread "weekend project" a 45 amp with MQ outputs and chokes, hammond power transformer.
Thanks
Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's