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There were a lot of testers that seem to be in between a pure emissions test and a full mutual conductance test. Usually they appplied a voltage shift to the grid, so you do get some indication of how the grid affects the plate current. If you have to push a button to get the reading its usually a tester of this type. testers like these will catch tubes that have grid issues better than a simple emissions tester that just tests everything as a diode. If you cant afford a Hickock, they can still be a useful tester.
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03-25-2015, 12:34 PM
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