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Vintage threads from the first ten years

6/25/2004 6:00 AM
sid gulick	ampeg ss b3 hello enzio--i have an ampeg b3 which blew all 4 power transistors, the small a06/a56 transistors, and a couple of 1n4148 diodes--that's what i've found so far anyway--and before putting good parts into the amp i thought i would try to trace the input and see where it breaks down. i immediately run into problems because this thing has a tortuous circuit board and lf074 opamps all over the place and without a schematic i'm just stabbing in the dark. is there a place i can get a good diagram of this circuit? thanks for your help. by the way, i checked for 39v across the driver opamp (3355?) and it's there. when i look at ac with a dvm there is a varying voltage there but when i look on a scope there is only a small angular ripple, like rc time constants on a diode rectified supply.

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