60 cycle hum

With the DVM + lead on the Base of TR708 and the - lead on E: On the V scale I read 15.32vdc and the relay is off On the mv scale the relay coil becomes active I can use the V and mv scale selector to act like a switch to turn the relay on and off. FYI the Emitter to E measures 15.84vdc...

Forum friends. I have a little ROTEL RX-200A with the dreaded ground hum. It's 60 cycles, across both channels, and it's like a mouse in a garage - every time I think I have it cornered I'm foiled again. Here's where we're at thus far: Replaced the main amp transistors and four of it's caps...

I'm repairing an Airline (Montgomery Wards) GAA-2940 console and after noticing the sound quality was a little off tone-wise and distorted, I have tested and replaced all electrolytic capacitors in the circuit (many were way off tolerance and quite leaky). The console now works fine - AM/FM...

I'm trying to eliminate a 60hz hum in a 1960 Motorola console stereo. I've replaced the power caps, the rectifier, the 12AX7s, and put in a grounded plug. I will be replacing the power tubes with a matched set of EL84s in the coming months (likely the JJ EL844s), but somehow I don't expect this...

Hi. I just finished recapping all the electrolytics in this preamp that I've been using for some time (better late than never). I had some issues with recitfier diodes but I've worked that out and I had eliminated the 60 cycle hum that given me trouble. After I got it back on the shelf (and...