Tales of unexpected hum sources: Thomas Vox Amps

[R.G.]

@cgoepel

Well, it's more a labor of mania. Just ask my long-suffering spouse.

I applaud you for fixing a customer's broken Beatle - and for the accurate explanation to the customer. The death knell for many of these amps is when repeated fixing attempts accumulates enough wire flexing so that every attempt to fix it makes one more broken wire.

To say "thank you" for you being willing to work on this amp, I'd like to send you a free copy of "The Vox Owner's Safety Net". Can you leave me a mailing address by PM?

[cgoepel]

R.G. Greetings from Maryland!

Would you mind explaining the two shield pieces, each roughly 5 inches square. One is steel and the second is aluminum. I have two V1141 heads in my shop. One of the units has both shields and is not particularly quiet regarding hum. The other came in with no shields. I fabricated a steel shield, without much success. I am wondering if adding the aluminum shield will quiet the hum which shows up only when the reverb is switched into the signal path. I took field theory in my University EE curriculum, but my schooling hasn't helped me common sense the solution of why or how both shields each affect the M field generated by the power transformer.