[NJARC] How to reduce ground hum

[Jim Whartenby]

Phil
Assuming that all tube operating voltages are nominal, do a detailed
inspection on the chassis for touching terminals and make sure the
replaced components are going to the correct terminals.  I think we all
have made a wrong connection or two when recapping!

Then check that the signal input ground is properly terminated.  Have
seen broken shield wires do some strange things in audio amplifiers.
Regards,
Jim

--- "VOURTSIS, PHIL, INFOT" <pv0301 at att.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Dear Experts,
>    I'm working on another cheap 3 tube amp (35W4, 50C5, 12AV6). I'm
> hearing an annoying hum when the volume is raised.
> All caps were replaced. It sounds like a ground hum. It's not very
> loud,
> just irritating. I replaced all the tubes, disconnected the input
> source, flipped the ac cord. It's still there. Any ideas?
>  
> Phil Vourtsis
> Pres- NJARC
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