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In Reply to: RE: Question about buzz sound, vintage guitar amp posted by PeterI on January 09, 2016 at 11:56:26
Is a guitar plugged into the amp when it makes the buzz?
ET
Follow Ups:
Yes, there are 3 input 1/4" jacks. Did the obvious things like switch out tubes. The noise lessens when I touch the chassis, but it has been removed from the cabinet for service. The chassis is not 'hot' - no voltage measured there. 3 prong plug added. Lifting power cord ground makes buzz louder.
Are all three input jacks grounding out, when nothing is plugged in?If you pull V1, does the hum go away?
Edits: 01/09/16
The schematic shows two terminal jacks, not grounding when unused. Shorting jacks would probably fix it.
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