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In a few radios, I have found tubes that looked pretty dead on a tester but still performed surprisingly well. You can think of various scenarios where someone might play a TV to death as long it made sound. Older person with poor vision, can't see the picture anyway. Uncle Joe listens to ballgames while working in the shop. Family gets new TV, but lets the kids have this in the basement to watch cartoons . . . .
Phil
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