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.
I noticed this circuite on the Tubecad webpage. Could a pair
of depletion mode mosfers like the dn2540n5 with a sutiable
source resistor be subsituted for the 2 triodes in the output
stage. How would you calculate the output impedience?