Electronics > Repair
General Radio 1396B Tone Burst Generator - Understanding power supply
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coppercone2:
I don't know, I am saying if you really need convincing you can figurre it out, but I would keep everything that measures ok.
barbaroja:
coppercone2 big thanks for your help, learning a lot.

Alright, just measured all of them. Just a made-up procedure where I charged them all to 10v with a controlled current and let them sit to see how they discharge. I recall reading in a manual of old vintage gear (cannot remember which one) that one could measure the discharge time with no load as a indicative of cap health. All of them but the big dual 400uF on the square terminal took more than 6 or 7 minutes to discharge to like 25%. The bad one was just a few seconds, so I guess the test does work. Interesting, the leaky 500uF Sprague on the scaler supply did just like the good ones. That one should not be as hard to get, tho.

coppercone2:
it is possible that it leaked and someone replaced it without cleaning pcb and that it is a good cap, hard to tell unless there is visible damage near the leads or whatever

I notice the better repair people, they mark the replacement parts with something like a scribe or paint marker.
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