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Wow. And one would naively assume every radio passed a performance test after final assembly. Something similar happened with a mid-60s Zenith color console that had suddenly gone dead. Shopped the set, and it had a B+ dead short. A red B+-carrying wire had gotten pinched under the lip of the front chassis apron, and the chassis bolts tightened down on it. It had run that way for a long time before the insulation finally gave way.
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