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Yes, I recall working on at least a few of those type Zenith sets in the late 1970's, of course then, it was time to replace the Horiz. and HV tubes! They were just getting old enough to begin to need sweep tubes at that time, so imagine my surprise when this set I have now, even with fairly heavy use, still has most of the original sweep tubes, which are now weak and slow, but still functioning! I will not operate this set much, until I replace those horiz. and HV tubes.
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