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im looking at used tubes and some people say they are matched by mutual conductance in mcirohomos and microsiemens and others say in milliamps? whats the real scoop thanks
Follow Ups:
To have power tubes really matched - you want to have them read generally the same for both transconductance (micromhos - from the better tube testers) AND for current draw (milliamps) at plate, screen and grid voltages that the tubes will see in their particular end application. Most tube testers won't provide that voltage.
Two tubes can read exactly the same in micromhos but be way off in current draw at working voltage.
Micromhos (that's ohms spelled backwards, really, it's the unit that describes the voltage gain of a tube) aka transconductance, is the most meaningful way of matching tubes. Triode Electronics has some good reading on the subject, poke around there.
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