Wyatt
Kick Henry Jackassowski
There are a lot more interesting ideas here. - http://fenderguru.com/amps/princeton-reverb/
There is also a lot of long-standing myth, misguided assumptions, and heresay on that site. Just looking at the quote you posted, it listed the mu factor, but ignores the relationship to rp, the difference in internal resistance, and difference in biasing between all those tubes.
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