1970 Zenith b/w 23", 14N22 chassis

[Adam]

This is the set that I keep near my bench to watch while I'm working on other sets. I picked it up 7 years ago on the curb, and used it as found, needing no repairs until now.

It developed some kind of buzzing in the audio, which I could hear even if the volume control was all the way down. I eventually noticed that adjusting the vert. hold would change the pitch of the sound, and also with the vert output tube removed, the buzzing went away all together. So I went about looking for some way that a signal from the vert oscillator could find it's way where it shouldn't be. But after fooling with the vert for several hours, and not fixing the problem, I found the trouble to be a bad electrolytic filter cap on the 215v B+ which feeds the audio output. While replacing this cap fixed the problem, I still don't understand how it could have caused it in the first place?

Also the vert output transformer makes a buzzing noise in itself, not very noticeable under normal operation, but it gets loud if you crank the vert size way up. Is the trans on its way out and should I start looking for a replacement, or is it ok like that? The vert works fine as it is.

Thirdly, in messing around with the vertical, I broke one of the pins on the socket (12 pin) for the 6FM7, I was able to solder it back together well enough to work, but I would like to replace the entire socket. Are these available anywhere?

While I have the bottom of the set off, I'm just going to do a complete recap of the electrolytics, figuring if one section of a can is bad, the rest may follow shortly. I don't think I ever posted a picture of this set, it's in the fake-woodgrained metal cabinet- I'll try and put up a picture later.