Bad 35c5 in 60's Zenith K725 killed the FM?

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Bad 35c5 in 60's Zenith K725 killed the FM?

TV MAN
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#6

08-14-2026, 10:56 AM

Hmmm... the 35C5 killed just the FM? This is interesting. Grid leakage. It would be interesting to pop that tube back in and compare the B+ voltages. Maybe lower B+ killed the FM oscillator only. Be good to know. Maybe the oscillator tube is a bit weak? I know some TVs use the audio out tube for some kind of voltage divider, so if it fails, something else in the set wont work. Don't think I've seen this in a radio, but maybe because I didn't have a need to look for it. Have a Zenith that has almost the same symptoms that you describe, so might be worth a check.

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Messages In This Thread

Bad 35c5 in 60's Zenith K725 killed the FM? - by Jayce - 08-13-2026, 06:15 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by David - 08-13-2026, 07:44 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by MrFixr55 - 08-13-2026, 09:23 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Arran - 08-13-2026, 11:37 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by radiorich - 08-14-2026, 10:21 AM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by TV MAN - 08-14-2026, 10:56 AM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Jayce - 08-14-2026, 03:39 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Arran - 08-15-2026, 02:13 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Jayce - 08-15-2026, 03:36 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Arran - 08-16-2026, 01:26 PM

RE: Bad 35c5 in 60's Zenith K725 killed the FM? - by Jayce - 08-19-2026, 04:38 PM

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