Re: Pye 1004 (Transistor Black Box) amp faults, help wanted please
I would first test the voltage on the negative of the output capacitor (collector of the lower transistor). It should be sensibly about half the rail voltage i.e about 4 volts in your fault case. This should at least give an indication of which transistor is likely to be s/c.
Probably then just an Avo 8 on resistance checking the transistors.
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George
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