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RE: 12AX7-EL84 magic

It's not going to measure very well and from my own experiences 12AX7 should not be used as a triode driver , the sound seems to lack in sparkle and life in comparison with a lower Rp driver . EL84 strapped as a triode has fairly high miller capacitance and the 12AX7 high Rp :- a recipe for poor bandwidth , the 12AX7 will also have excessive gain . There are much better valves out there to drive an EL84 such as the 12AT7 , 5965 and E80CC

Pentodes on the other hand do not have the same capacitance issues as triodes . If you have a 12AX7 driving a pentode , leave it as it is . Re-strapping to a triode will incurr the issues detailed above , some may like this sort of sound . Unfortunately I don't ;)

Al

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