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Re: so, hopefully, this explains why ...

I'm not privy to all the details, but they state a current and a Gm spec on each tube so one would expect they are tested for both.

I do know that at least some of the USA distributors test for plate current, not cathode current. I've been told this directly from them. I also know the amount of warm up/burn in time varies a lot. The tubes in your amp simply may have changed from use. The longer the burn in, the less likely the tubes are to change significantly - but the longer it takes and the more expensive it is. So burn in is a compromise in any case. I know of one distributor who told me some time ago they only run the tube until it's warmed up (a minute or two) - and others like the New Sensor brand family (and probably some others) run them 24 hours.

In general, Ruby seems to do the best job of matching of the "big guys". I will say that it used to be better than it seems to be now. I have never purchased matched tubes from GT, so I can't tell you about the quality of their work, sorry.


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  • Re: so, hopefully, this explains why ... - Jim McShane 10:48:42 12/11/06 (0)


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