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That tube tester's veracity is questionable regarding an HK short in the CRT. If there were a heater-to-cathode short, it would kill the video signal going into the CRT as well as show a heavy hum bar (since the heater is 6 VAC away from ground, thru the 6X5's heater). In a case like this, the TV itself should be the best "tester" of the CRT.
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