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I have been repairing stuff for several decades and have used both transconductance and emission testers. Frankly, for me at least, the transconductance units aren't worth it. A tube isn't likely to change its gain when its parts are of a definite size and spacing. These testers are best for building tubes, or matching tubes from different manufacturers, in my opinion.
Every bad tube I have found tested bad on an emission tester.
I don't want to start any flames; these are my opinions based on lots of experience, and each person is an individual.
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03-19-2013, 01:28 PM
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