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I'll agree about the tube tester. I've seen horizontal output tubes in color TV's check good on a tube tester but wouldn't do anything in the TV. In many cases, the best test for a tube is another tube. A friend of mine who fixed TV's during the tube days told me that all a tube tester was good for was selling tubes.
I've also run into new parts that were bad. Usually, these were cheap generic transistors, IC's, and flybacks that I ordered trying to save a dollar. Like they say, you get what you pay for.
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