« Reply #1 on: November 20, 2024, 08:15:29 pm »
All the semi-conductors test OK out of circuit in my DCA75 tester.
According to your measurements that BD 140 with both collector and emitter voltages at at 55 V shoud be dead.
If on a heat sink, bad isolation could be shorting out this BD 140.
« Last Edit: November 20, 2024, 08:17:20 pm by Messtechniker »

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