Not the cause of the problem that it is here for repair, but I cannot return
it to the owner with this glaring potential (in both senses) fault,
presumably the same for all such Warwick amps.
One large heatsink with +75V on it and the other at -75V and 2.5mm between
the two , both mounted on standard polyester pcb with chassis standoffs well
away from the heatsinks. Discharged both before this test of course,
requires only 1.5Kg of force between the 2 heatsinks to narrow the gap to
1.5mm.
Have amp designers never seen the internals of their stuff
resonating/oscillating mounted in or on speaker cabs, especially bass amps
such as this?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/