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Old Today, 12:44 AM
Phil Nelson's Avatar
Phil Nelson Phil Nelson is offline
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Join Date: Jan 2006
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Well, the doorknob cap was bad, after all. When I played the set to check another issue, a faint tick-tick returned in the HV section and then the cap failed, causing hash in the video and loud static in the audio. When I swapped in a doorknob borrowed from my National TV-7W (which has four to choose from), the picture stabilized.



I don't have a cap checker that can test at such high voltage, but out of curiosity I temporarily clipped the old doorknob cap in parallel with the good one. It immediately started hissing, so I guess it really is a goner.



There's more work to do on this set, but I'm counting this problem resolved. Thanks again for the good advice.

Edit: Does anyone know a good source for doorknob caps other than Surplus Sales of Nebraska? I can't order the same kind that I got from them before, because the National set takes a slightly smaller physical size.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

Last edited by Phil Nelson; Today at 01:38 AM.
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