stevem Messages: 4728 Registered: June 2004 Location: NY
Senior Member
PNP type transistors can not be used in these amps without massivly reworking the driver circuit board on the rear wall of the amp.
Like Bill posted for you the transistors are 2N3055 which are NPN type.
I use NTE130 transistors for these most of the time.
Since the amp has been fitted with the wrong output transistors I would check all 4 of the box type 5 watt emitter resistors and I would also check all 4 of the boxed heatsinked driver transistors.
If you got look at the Technical to the left of the screen here we have the schematics you are asking about.