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nice looking set!i had a zenith roundie that had the same blue gun issue.a gentle tap on the lowest setting would bring it back for a few days at a time.finally got tired and replaced it with a hi-lite crt.not a good swap.looked good in a rca,but wasnt good in the zenith.convergence might hace a coil unwinding on the panel.found this on many zeniths.popping noises sounds like caps.should be an easy fix.great find!
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