Spring Line Hum

[John Speth]

All this talk of hum can't possibly be that difficult.  (Coming from a guy
with no experience :) ).  I have an old Yamaha G212 guitar amp with a 1 foot
long reverb tank.  It's mounted right on the head.  Both the head and the
tank are made of that yellowish metal.  When the volume is turned up to 10
and the reverb is turned up to 10, you hear practically no hum.  And you
can't hear any difference rotating the reverb control full on to full off.

So the hum problem certainly must be preventable.  I haven't got any
schematics for the amp so I don't know what circuitry drives it.  But I'll
bet the secret is in just-the-right shielding - a low tech solution that
Yamaha has shown to work well.  So isn't sheilding the tank the solution?
Seems non-elegant over-engineer an under-engineered problem.

John Speth
Molectron Detector, Inc.
http://www.molectron.com
mailto:johns at molectron.com 
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