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Unfortunately, testing a cap with one of these "old school" Wein bridge testers requires it to be out of circuit and to do the leakage test(s). Since one lead is disconnected anyway, you're @ 25% of the labor to just replace it; many many folks have documented that almost every paper/mica/electrolytic out there on vintage gear repairs is just about guaranteed to be A) way off in capacitance or B) D.C. operating voltage leaky. The modern ESR cap testers use a ~~ 200mV 100kHZ test signal to effectively measure the power factor/leakage in circuit, which can be thrown out the door if the cap is seeing potential above that and up to its rating. This is a reason why the old school high voltage leakage selectable testers are still valuable.
Tom (PK)
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