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Drive voltage enough for SE el34, kt77, and 6L6 tubes?

el34 kt77 6L6 tubes

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#1 plasticdub

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Posted 14 August 2020 - 02:56 PM

Looking for help in figuring how many 12ax7 stages is needed to fully drive a single ended amp using any of these power tubes. I believe the EL34 data sheet says that for SE use, the grid no. 1 driving voltage needs to be 8.7 Vrms. On the 6l6-gc it says for cathode biased "peak AF grid no. 1 voltage = 12.7 volts"
 
Can a typical Fender-ish simple preamp w/ a single 12ax7 tube being - first stage > tone stack > second stage be enough to achieve this objective? Or if there was no tone stack, would that be enough to do it?

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#2 rmc001

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Posted 23 August 2020 - 10:45 PM

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