I did.replaced it anyway.with the original p/n. I know that this sort of malfunction (bridge installed backwards)can back up and screw up a lot but the only damaged components I initially found were jfet transistor Q9 which literally exploded and R35- 4.7 ohm emitter resistor. even the bridge checked out although I did rebuild the power supply-caps,diodes,bridge etc.all other transistors checked good but at this point, ruling out nothing I have replaced them all with no change.the entire preamp stage up to the junction of C26 & R48 has good clean signal. from the power amp side of R48 nothing but wildly high negative dc voltage. strange readings here; read across collector and emitter of Q12 & Q13 is...+60vdc. across collector and emitter of Q15 & Q16...-5.6VDC. reading at junction of D18 & R56 is... -24vdc. junction of D20 & R51 is... -.820 mv
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