Tubes Asylum

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In Reply to: RE: How To Test Vintage Tubes posted by Lynn on May 11, 2008 at 18:45:20

Yes, tubes vary considerably (which is why matched tubes cost more). This is good evidence that your tester is working correctly.

Personally, I don't think calibrating a tube tester is particularly important. If a tube measures well into the "good" area, and you can compare perfomance across many tubes, as you have, then you can be reasonably sure that the the tube is good. You can also use a non-calibrated tester to match tubes, as all "matched" means is that two tubes behave alike within some range.

All a noncalibrated tester CAN'T do is tell you precisely what a tube's transconductance is, and that just isn't that important.

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