Cascode SRPP

Circuit #8

This circuit has several names, it is basically a common cathode amplifier which is loaded not by a resistor, but by another triode acting as kind of current source.
See discussion on Elliott Sound Products
If you make Rk1 equal to Rk2, the circuit is actually 2 triodes under the same operating conditions. Do not make cathode resistors too different as it will quickly unbalance the circuit.
Note that the output is to be taken on Vk2 point (not on Vg2).


Select T1 T2 type

V supply voltage

Ω T1 cathode resistor

Ω T2 cathode resistor