How about that feedback capacitor between the cathode of the first stage, and the plate of the second stage.
Adjusting the 500k potentiometer will have the voltage direction against the electrolytic polarity.
It can not work with an electrolytic, sometimes the voltage polarity may be correct, and sometimes not.
Use a plastic cap.
There may be other problems with the circuit.
What is it supposed to do (what will be the input signal voltage, what is the transformer turns ratio, what kind of load will it drive (next stage input impedance, shielded cable and how long, etc.). This will not drive more than an extremely short cable, and only a very high impedance stage. It will likely roll off the high frequencies.
Adjusting the 500k potentiometer will have the voltage direction against the electrolytic polarity.
It can not work with an electrolytic, sometimes the voltage polarity may be correct, and sometimes not.
Use a plastic cap.
There may be other problems with the circuit.
What is it supposed to do (what will be the input signal voltage, what is the transformer turns ratio, what kind of load will it drive (next stage input impedance, shielded cable and how long, etc.). This will not drive more than an extremely short cable, and only a very high impedance stage. It will likely roll off the high frequencies.
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