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Old 12th September 2007, 06:05 AM   #11
OzMikeH is offline OzMikeH  Australia
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Join Date: Mar 2007
Diodes used like that are to exploit the volt drop across them, it is to provide a low impedance way to get a 0.7V drop for the bias of the power transistors. The PN junction in the transistors is also about 0.7V

The good news: any old standard diode should work provided the current rating is suitable. (no schottkys/high speed, just a dumb ol diode)
The bad news: usually the diode is killed by a shorted transistor.
while you have the diode tester out look for a shorted Base-emitter or base-collector on one or more transistors.

When powering up for testing use safety resistors, (see elliot sound products webpage for tips)
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Old 12th September 2007, 06:28 AM   #12
ashwick is offline ashwick  India
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Join Date: Aug 2007
O.K.
Thanks again
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