Mellotronists

Never had anything electromagnetic come over audio in a tron, but we did
have a *very* microphonic machine at last year's progwest. Big feedback at
the beginning of a set, and through skillful audio network signal routing
manipulation and brilliant on-stage troubleshooting (also referred to as
"mute buttons") narrowed it down to the poor white beastie. A couple of
investigative shockwave impulses (also referred to as "knocks") on the lid
of the tron came over the monitors loudly and cleanly. Uh, what the heck did
we do.... I think we just turned the wedges away and went on with the set.
Not one of my trons that time. My suspicion was that the headblock mounting
was somehow hosed up - anybody seen this before?

Hey that brings up another question - I think I read somewhere that the
headblock needs to be electrically isolated from the rest of the aluminum
(oops make that aluminium) frame. True, False? What happens if it's not?

Best Regards,

- Gene