IF it's the aluminum doing something that steel wouldn't do it is
causing
eddy currents to flow through it, shunting the magnetic field slightly...
perhaps this is causing a change in the lams slapping themselves, or the
lams against the chassis behaving like an electromagnet (buzzer).
Usually, the lift from the chassis and isolate works well enough.
I'm thinking that the eddy current thing might have merit, since
there seems to be some effect upon audio output trannies when they
are lifted off the chassis (no coupling).
_-_-bear
--
_-_-bearlabs
http://www.bearlabsUSA.com
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