Re: amplifier hum

Tom,

Before you start randomly purchasing more hardware:
carry the amps off-site and see if the problem persists

try coiling the wires tightly - if it's RF, this will make a change

try a small shunt capacitor installed in the cable end - try amp-side
first

the ferrite suggestion is excellent - if it works, it's RF
if you have an old monitor or keyboard cable with a big bulge -
that's ferrite
take it apart and try putting it around your guitar cable
slide it back and forth, position may help it's effect
if it helps, email me and I'll send you some

to check on the 60-Hz humm from house fixtures:
turn off all electricity in the house except one set of wall outlets
unplug everything from the wall except the amps
try the amps then
if the problem is gone, you have a scavenger hunt
if the problem persists, it's not your house

etc, etc etc

Transformers, like the ebb-tech stuff or passive DIs, can eliminate
ground-loop phenomena, but I seriously doubt you have a ground-loop
issue unless there are other hardware pieces in the signal chain you
have failed to tell me about. Transformers can also act as a low-pass
filter to soak up RF. But cheap ones also trash the signal along the
way - so beware.

--
-don hindenach-
donh at audiosys dot com
.