I doubt if this can ever be resolved. I had a S500 that had the same noise. Now I have a s550e which sounds amazing but has a slight buzz through speakers when idling just like the S500 had. NOTHING I do gets rid of it. Lifted gnd on power cord. Removed input cables. Switched to balanced input. Can’t hear when playing music but bothers me to hear noise. It was dead silent until the rectifiers were updated and bias pots replaced and adjusted. This must be common in these amps. I’ve read other posts on this. Has anyone ever resolved it?
Undo the update of the rectifiers. Why were they changed in the first place? Did the routing of the wiring change? Did you rotate the transformer? Are the ground connections as tight as before, and so on. In other words, revert to the original if all was good.
The new bias pots can hardly be a problem, I would think.
Hugo
always handy to have pics, before and after
at least for me, too old to remember all details
when I was younger, with better memory, then I didn't know what's important to remember
at least for me, too old to remember all details
when I was younger, with better memory, then I didn't know what's important to remember
I took it to a highly regarded tech for the work because bias went out on one channel. It was a bad pot. In the service the power input fuse assembly was replaced because it was burnt from loose power cord. The rectifiers were updated to high speed. The amp sounds amazing. But I’m a perfectionist and disappointed with this because of the newly introduced buzz/ hum that I was happy to get rid of on the S500 Just looking for possible causes. The S500 was never serviced or updated. Just bias adjustment.