#31
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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. Regards, Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html Last edited by Phil Nelson; 01-16-2017 at 08:58 PM. |
#32
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Phil,
How did you get that chassis so clean looking, it almost looks new. Ed Last edited by EdKozk2; 01-18-2017 at 12:18 AM. Reason: spelling |
#33
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Both chassis on this set had bad rust. After using Naval Jelly & the usual tomfoolery, this chassis still looked rotten, so I painted it (not my usual practice).
Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html |
#34
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Better than having rust.
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#35
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Nice job
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Audiokarma |
#36
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Need replacement for DuMont 20D-4901-2 vertical blocking transformer
I have the same problem. Anybody have any idea where I can find a replacement? Playthings of Past is currently "down" while the new owner tries to organize all the stuff he purchased from Gary. Is there any way to use two transformers or otherwise to re-engineer the circuit?
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