Greetings good people at GrouDIY. Getting a ~100hz hum off the repro head when recording (electrical hum). It's on channels 17-24 only, so logic tells me it's caused by something that effects an entire row of channels. After testing with 24/15v cables in the VU section, I tried swapping audio power supplies (the 3 biggies at the back bottom) and that made it clear the issue is with the third audio power supply. I'd previously updated all the elcaps and rifas and double checked all solder joints, so it's not a cap, or poor connection issue. Wondering if it might be a bad rectifier. Have a scope, but not sure what I should measure to trace the issue. Any guidance by the experts here would be greatly appreciated.
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