Quote:
Originally Posted by Zenith26kc20
Here is the first screen shot of the Zenith I've been working on! It's rough and needs a lot of TLC but it's alive. Good scare on power up! Someone (not me) left the cap off of the 6bk4 tube. Talk about racket. I thought "now I gotta change the 3AT2 filament winding" but a bit of looking and we have no more popping!
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Let this be a lesson: always look things over very carefully and correct any problems (such as, in this case, disconnected tube caps)
before applying power. You are very fortunate the high voltage didn't go through the roof (or worse) with that 6BK4 plate cap off the tube, since this renders the high voltage regulator inoperable. That's probably why you heard so much noise -- it was quite likely high voltage arcing. Continued operation of the set in this condition could destroy the flyback, the 3AT2 HV rectifier or other components in the doghouse (HV cage).
I don't know how common replacement flys are for your Zenith color set, but since these TVs are now over 40 years old, finding a replacement could be difficult if not downright impossible.