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A tube tester is good for checking that the heaters are still intact, although you can do that with a DVM and a tube basing chart (on the internet). Testers can also test for shorts and basic emission, but still the best test for any tube is in the equipment in which it is designed to serve. Sometimes a tube that tests bad or marginal in a tube tester will work fine in a device.
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Reece
Perfection is hard to reach with a screwdriver.
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