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Agreeing with the previous two posts, you can't test a horizontal oscillator accurately on a tube tester. They can have perfectly good emission & no gas, and still not be willing to run at 15.750 Kc. You pretty much have to have 2 or 3 to try, and pick the most stable. Same goes for RF oscillator and IF tubes.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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