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tube amp hum........normal or suggested fix?
tube amp hum........normal or suggested fix?
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Old 4th January 2013, 02:23 AM   #31
wiredwithtubes is offline wiredwithtubes  United States
diyAudio Member
Join Date: Dec 2012
Location: Atchison, Kansas
2. Disconnected ground from RCA jack inputs that ran to ground on large electrolytic caps and connected them directly to center chassis bolt "star ground" to which earth ground and power transformer center tap (red/yellow striped wire) are attached

These changes did two things:
1. The hum in the right channel is gone (this is wonderful)
2. The left channel now has a buzzing sound (this stinks and is worse than the original hum problem).
Is that all you changed, move the ground wires from the input jacks? If so check the ground wire between the left jack and ground. You might want to check those input jacks, they look like they might be insulated from the chassis, one might be touching the chassis creating a ground loop.
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