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RE: Well that was quick.......

Let this go Vinnie, you're just confusing yourself. There is often a LARGE variation in plate and/or cathode current between tubes. So the curves may show -40 but that's only true for a few tubes of the type. Due to internal construction variances & variances of heater voltage the -40 might need to be -32 on the next tube or -51 on the next after that and so on.

The curves only apply to a "bogey" tube under very specific circumstances. The typical tube in a typical amp often shows significant variances even with identical circuit characteristics - because the tubes themselves often perform far differently than the bogey tube does.

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