Wayne the tube tester is a good idea and good starting place ---but I would like to have a good set of the same brand of tubes in an amp ( I have a Pilot and Knights and fishers that all use the same type of tubes) and can move them from one amp to another to hear differences in them----one test I read from some ebay aauction is to test the tubes at amp voltages as opposed to testing at 150 volts ---your thoughts Jim
Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
Absolutely. But tube testers have a voltage adjustment, so it isn't fixed at a specific value. The voltage a tube is run at sets its operating point. Look at load lines and you'll see the differences. In the linear region, increasing voltage increases current by a proportional amount. Load lines plot the transfer curves.
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