I’m pretty sure there are all sorts of reasons why this is a bad idea and SUTs are better etc.
I’m interested in a solid state active step up device to couple a IO1 to a Puresound P10. This below really interests me, although obviously wont work as is.
Parts List for the Common-Base Head Amplifier
R1 - 100 kohm
R2 - Select for a battery current of 0.125 mA, typically 330 kohm
R3, R4 - 1 Megohm
R5 - 2 kohm
C1 - 0.1 ufd
C2, C3, C8 - 100 pF
C4, C5, C6, C7 - 100 ufd
Q1 - 2N4401
Q2 - 2N4403
Any thoughts about getting the impedance and gain in the ball park with something like the above?