Hello!
I have to repair an old Cabotron amplifier.
The amp is a common class A-B, with MJ15015 e MJ15016 power transistors.
I have the output stuck to negative rail: checked all the transistor searching for an "opened" one, every transistor is ok (also in the driver part).
What may cause this kind of fault? Fuses are not blown.
Thanks a lot for the answers!
Ivan.