Peavey Studio Pro 40 dead no signs of life. Where to start ?

[phatt]

Whould it not be simple to check the wire colour on the *Speaker output socket*?
Tip is usually the hot +positive wire.
Phil.

[Enzo]

It would if the amp had one.  Like most PV combo amps, at least of that era, the speaker wires come up from the speaker and terminate with a white Molex connector that plugs onto a couple pins on the circuit board.

[phatt]

Whoops.
Oh I see what you mean.
Don't mind me,, carry on.
Phil.