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tube matching

Posted by mark_m (A) on September 22, 2004 at 11:14:27

What is involved in proper tube matching?

I pulled the EL34's in my ST70, checked the bias voltage on each, one at a time in the same socket. One was much higher than the others - I set the bias pot to give me .78 volts on that tube. The three remaining read something like .44, .46 and .49.

Is measuring the bias difference in this way meaningful? If I find a tube tester, what do I want to look for in matching these tubes?

Can I get information from a tube tester that would allow me to search for another original Mullard EL34 that would match, without having it in hand?

Thanks much for any information. BTW I'm around Berkeley CA if anyone knows where I might go to test tubes...

Mark M.
"Politics is the entertainment branch of industry" - FZ

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