Hi everyone.
I'm trying to repair a 1970s home made guitar amplifier.
Inside it has 2 Auditec 001 MK2 modules.
They have 2 2N3055 as output devices, and the diode rectifier bridge is on board, but the filter caps are off board.
I've found a few faults such as a shorted 2N3005 and its driver a BD140, but when I power it up carefully using a variac and dim bulb tester, I get over 5 volts DC across my 8 ohm dummy load on the speaker terminals.
I suspect something else is faulty although all the semis check ok on my meter.
Anyone have a circuit diagram for these?
From memory I think Delsound in Brisbane at least used to sell these in the 1970s.
Thanks,
Raff