I am in the process of trying to fix (ever so nervously) my 1979 Peavey Century. As a thought, i took off on of 4 small plates, finding this guy underneith. On his top he says RCA 7901 and 62792. Any help would be great. Also, is taking this amp apart a bad idea??? (clickable thumbnail ) {}
Power transistor. Also, the plastic plates are integral to compressing the transistor against the case, which is the heat sink. Put those plates back on. They exist because the body of the transistor is at a high voltage. Also, you will note a thin slip of insulating material between the transistor and the case. This can be a bit delicate if you try to pull the assemblage apart. And there is thermally conductive goop in there as well. Put the plate back on. There should be 4 screws at the two ends of the back panel that release the entire panel. That's how my old Peavey head was. The front panel comes off the same way. As those transistors are part of the power amp, which you said works, they are not involved in your problem. Sorry to sound snappy with you. I just wanted to make sure you have the correct information before proceeding.
I'm not sure if someone already mentioned, but this power transistor is lacking one mounting screw (plus insulating washers/feedthrough). You should fix this since the transistor requires good heat contact to the metal surface underneath.
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