Sansui R-30 Receiver Transistor replacements

[Peter]

Sansui Receiver R-30
Power trannie burnt out in the primary
Traced to shorted output transistors in one channel
BD 203 and BD 204

I replaced them with TIP 31A and TIP 32A
(Also replaced power trannie of course)

After playing for a couple of days the BD 203 and BD 204 in the other
channel went short and took out the mains fuse.
Replaced these with 2 more TIP 31A TIP 32A

Was it bad to leave one channel with BD 203 BD 204 and the other with TIP
31A TIP 32A

Peter

 

[Sofie]

snipped:

Was it bad to leave one channel with BD 203 BD 204 and the other with TIP
31A TIP 32A
Peter

 

[Mark D. Zacharias]

This model is kind of notorious for repeated failures. I would recommend
replacing the bias transistor, and adjusting the bias to about 10 millivolts
as measured across the emitter resistor pair.
Personally I would stick with original type output transistors as well.

Mark Z.