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RE: Help with KT150 questions

Posted by Alex Kitic (A) on April 21, 2020 at 14:09:52

In Reply to: RE: Help with KT150 questions posted by Tre' on April 21, 2020 at 09:07:22:

Hi Tre,

You are nitpicking a little - but I don't mind because I am used to that.

This is not about hidden shorts - the tubes are obviously working in the circuit that has allegedly higher voltage than the Hickok tester can test at. The OP seems to wonder if the tubes are good or not, and why do tubes of the same type and same (in this case, the only) manufacturer sound different.

You are not supposed to get matched tubes from the factory with hidden manufacturing defects like shorts, but it can happen.

Transconductance can and will vary with voltage and bias, as well as g2 voltage in this case.
But in practice, a pair matched at one voltage (operating point) will still behave as a matched pair at another operating point. Not that matched tubes matter to me, since I am only interested in SE amps - but it's nice to know tubes are matched for left and right channel.

And, I agree with you that the best tester for the tube is the circuit in which the tube is supposed to be used. But it is my impression that "regular users" can't check how a tube is behaving in the circuit and have to rely on tube testing results and techs...

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