I am working on this amp for a friend when I received amp had a bad vibrating type hum from transformer when just turned on I replaced power rectifier diodes and amp has no hum and is very quiet when power on. Amp is working fine power output wise also but when keyed has a small hum coming from it this does not show up to anyone I am transmitting to unless they hear it thru my microphone. Any suggestions on what to do or is this normal for this amp. Thanks Jimbo
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