Quote:
Originally Posted by benman94
I hate to be the bearer of bad news, but with a set of that vintage, a shotgunning of the original paper caps is strictly necessary. A set in that state is essentially impossible to troubleshoot as you suggest. There's no video, weak sound, insufficient vertical sweep, horrid hum (though it might be 6BN6 buzz; Westinghouse and Zenith were fond of the 6BN6 in that era). And that's just what we can see that's wrong with the set. You could be running at extremely high horizontal output cathode current thus putting your flyback at risk, etc.
Plan on replacing all the paper caps and electrolytics, but you can do what I do (as suggested by Phil Nelson): replace a handful of paper caps, say six or seven, then plug the set in and make sure you haven't made anything worse.
Start recapping in the sweep sections and power supply first to avoid nuking an unobtainable part.
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Well, shucks. Was hoping it'd be like one of those videos where replacing a few tubes and it plays "fairly well". Beginner's luck I suppose!
It's possible the sound issues you mentioned could be caused by the cheap DTV box I was using for that, so if that persists after doing recap I'll try other sources and see.
I've ordered a full set of caps and agree with your technique of recapping in small batches to make it easier to spot and roll back mistakes. The good thing is that this cabinet has a lot of space to work and seems very simple to get the chassis in and out so hopefully this will be a good learning TV!
Thanks for the advice!
FK