ampdoc wrote:
I got this in, and someone else had attempted to repair it, the other guy
told me he had replaced the finals several times but they kept failing on
power-up. Looking at the output stage I think one of the FET's may be
incorrect. Could someone check the schematic and see if this unit is
supposed to have 2 IRFP140's for finals (both outputs N-channel?!)?
I believe this should have a complimentary output pair, IRFP140/IRFP9140, N
and P channel, but as I did not see it before parts were changed I'm not
sure.

Jammy

Call SLM and they'll email you the schemo. Just for reference, posting
in alt.guitar.amps will get more responses.