A friend came by and said while he was keyed up and yappin, there was a power surge (sounded like a slight delay power switch from the electric company) and suddenly the amp started smoking. Power supply did not suffer any issue nor did the radio.
Without hooking it up, I took the cover off and R5, R7 and R8 were toast. Fuse didn’t blow (30A). I replaced the 3 resistors, reconnected to power and OFF, R8 toasted immediately. I pulled one leg of D4 even though the fuse was intact, and it tested to still be a diode. Then for shits and giggles I checked the resistance between the positive and negative rail which gave a 189 ohm reading. This gentleman is on a fixed income and disabled and without saying it, there is no way he can replace it financially. He’s a true radio head and has been since the 60s and I’m trying to help him out. I’m trying not to disassemble the entire amp but if the board has to come out, I won’t be lazy about it. Both he and I would appreciate any assistance you all might have.
Without hooking it up, I took the cover off and R5, R7 and R8 were toast. Fuse didn’t blow (30A). I replaced the 3 resistors, reconnected to power and OFF, R8 toasted immediately. I pulled one leg of D4 even though the fuse was intact, and it tested to still be a diode. Then for shits and giggles I checked the resistance between the positive and negative rail which gave a 189 ohm reading. This gentleman is on a fixed income and disabled and without saying it, there is no way he can replace it financially. He’s a true radio head and has been since the 60s and I’m trying to help him out. I’m trying not to disassemble the entire amp but if the board has to come out, I won’t be lazy about it. Both he and I would appreciate any assistance you all might have.
