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In Reply to: RE: Best sounding power pentode/tetrode in triode for SE? posted by andy evans on October 03, 2020 at 02:14:02
EL509/519 in Enhanced Triode Mode connection
or
EL504 in triode connection
Follow Ups:
It works. A couple of decades ago Melos built SE monoblocks with I think 2 output tubes and got 70 watts. But the way to make a triode with these tubes is to drive the screen which takes current. And in order to get maximum power from them you will probably need to drive them with a solid state device. Melos used a MOSFET cathode follower after the driver stage.
I read that the plate resistance of a pentode in Enhanced Triode Mode is about the same as if connected as a pentode.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
...Although the term is "enhanced triode mode", the actual operating mode is still pentode. Attached plot is for 6CL6 pentode where g1 is held constant (at 0 V) while g2 is varied as with enhanced triode mode. The set of curves is clearly characteristic of pentode mode of operation although spacing of curves is maybe a bit more linear than conventional constant g2 V variable g1 V.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
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