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Yeah, my older (tan) C3 Heathkit did the same thing. I had just got it and it worked for a few power ups and then a sharp pop and nothing. I never bothered checking the DC outputs. No eye and the unit is NO good, so I just popped in two 10mfd 500VDC power supply filter caps and everything came back. The outputs aren't dead on face value, but they are in the ballpark. Drifted resistors likely cause that I imagine. I have another where all outputs are low and the resistors check out. I'm figuring a cap I haven't replaced maybe. I've only been messing with old cap testers for about a year. I never wanted to repair my repair equipment in the past. I most often do more work with VTVMs and cap testers than I do radio or tv. Something different is nice.
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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