I looked at Terman's circuit and put it in a feedback loop, very interesting FFT but H2 is maybe too low, only 10db higher than 3rd.
Thd is very low on the Terman so I sent out the board with capability of operating in all three modes described in Glen Richardson's 1952 inverted triode thesis. All of the circuits have data from very low voltages (zero) .
Thd is very low on the Terman so I sent out the board with capability of operating in all three modes described in Glen Richardson's 1952 inverted triode thesis. All of the circuits have data from very low voltages (zero) .