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Original Message
There's a reason for that..,
Posted by Steve O on October 4, 2020 at 20:58:41:
...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.