• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

CCS with VN2222L

Elvee

Member
2006-09-08 2:04 pm

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jcx

Member
2003-02-17 7:38 pm
..
the LND150 http://www.supertex.com/pdf/datasheets/LND150.pdf is more appropriate to the 12AX7 single digit mA plate current


a HV PNP "ring of two" feedbck ccs or Zener/LED Vref hanging from the V+ supply is a natural choice, cascode if high perfromance is necessary (PMOS pass divice also possible)


with a bufferd output stage the bootstrap RC ccs doesn't require special silicon and may be good enough