I read in sci.electronics.design that Patrick Turner
wrote (in
u) about 'A little feedback worse than none at all?', on Sun, 16 Nov
2003:

The loading seen by the 12AX7 restricts its output, since a typical idle
current is a low 0.7 mA. So a load which a bjt might drive easily, say
1k, can only have 5vrms of output, from a 12AX7, and with far greater
thd, because the RL seen by a triode should be many times its Ra.

I wouldn't dream of driving a 1 kohm load with a 12AX7. I can't see that
what you say is relevant.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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