Pioneer SX-737 issues

[Electronic M]

I've been told there's a good stock of Russian germanium transistors on IIRC ebay.

[vortalexfan]

Originally Posted by Electronic M

I've been told there's a good stock of Russian germanium transistors on IIRC ebay.

Would they be direct replacements for a 2SD370 and a 2SB530?

I'm wondering because that's what this receiver uses for its output transistors.

Also how do I test to see if the output transistors are truly fried on this receiver?

[Ed in Tx]

Originally Posted by vortalexfan

Also how do I test to see if the output transistors are truly fried on this receiver?

Simple E-B-C testing of any of the transistors with an Ohm meter would tell you if they are shorted. E to B and C to B should test like a diode, conduct one way, not the other. I'm sure there's a Youtube video somewhere explaining how to do that.

[maxhifi]

Originally Posted by Ed in Tx

Simple E-B-C testing of any of the transistors with an Ohm meter would tell you if they are shorted. E to B and C to B should test like a diode, conduct one way, not the other. I'm sure there's a Youtube video somewhere explaining how to do that.

Better yet would be the diode check function of a multimeter, so you can read the junction voltage. This is really basic stuff, and every transistor on that channel will need to be checked now.

[jr_tech]

An inexpensive China tester is another alternative.



Shown testing a common TO-3 packaged 2n3055 npn silicon power transistor.

jr