Sencore TR139 Transistor Tester

[aaronwhite30]

Can't give enough credit to this handy gadget. It helped me diagnose a difficult subwoofer amp repair. The transistor that was the problem tested great on a diode multimeter setting, a reasonable assumption, but the TR-139 gave an "in-circuit-test" of 0 beta and maximum leakage test. Had I not have this, the repair would have been a crap shoot.