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My literature says, "within 7ma". Is there a correct answer? I know many amp techs think 'matching' is pure BS. I tend to agree after my own experiences.
Only once have I had a pair of tubes that exactly match. This was a set of Svetlana 6L6's(SV6L6GC). They gave an exact reading on a duel-bias probe.
Because of the minute price difference, I usually buy sets in matched pairs but, have never found a problem using a tube that was 5ma+/-.
I'd like to hear from folks like "Big Cookie" that actually do amp building/restoring.
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