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City: Menlo Park
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Cap replacement is completed. (Excepting PSU filters for now). A cautious power up got the expected behaviour of the dim bulb, but atrocious FM reception and nothing at all on AM. I looked around the areas I had worked, and eventually found some components disturbed near the last IF can for AM.... I'd pushed them causing leads of these components to short out the IF transformer Fortunately no lasting damage done, and rearranging the cap and resistor positions brought everything back to life.
I don't hold with furniture that talks.
Messages In This Thread
RE: Zenith H725 - by EdHolland - 03-24-2025, 06:56 PM
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Recent Posts
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Philco 42-345 Restoration/Repair
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| Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM |
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Philco 42-345 Restoration/Repair
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| Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM |
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Philco model 38 code 121 not receiving signal.
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| Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM |
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Testing a speaker and output transformer Trutone A2-G
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| The equivalent of one short turn is basically the same as that of a shorted load.
If it is the primary's turn, then the ...morzh — 03:53 PM |
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Testing a speaker and output transformer Trutone A2-G
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| I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM |
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Philco model 38 code 121 not receiving signal.
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| As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM |
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Philco model 38 code 121 not receiving signal.
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| Well why not! :lol:Stormlord5500 — 03:14 PM |
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Philco model 38 code 121 not receiving signal.
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| Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM |
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Testing a speaker and output transformer Trutone A2-G
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| morzh
Short-circuited turns can be considered as a half-dead transformer.
But on this case transformer will hot and s...Vlad95 — 11:01 AM |
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Testing a speaker and output transformer Trutone A2-G
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| I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM |
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