I did not use any HHO cell, neither a big transistor, as I just wanted to test the circuit.
I tried it with the following specifications:
L1 and L2 are a toroidal bifilar coil.
Measured inductances = 2 * 0.31 milli Henry.
The transistor is a 2N2222.
The HHO cell is replaced by a mere 92 nano Farad (measured) capacitor.
The voltage, the resistances and the potentiometer are the same.
I did not use a 50 micro Farad cap because I found it too big. I first used a 22 micro Farad one.
After some explorations with the 10 K pot , I managed to trigger the CCT and got this kinda 'hacked' wave form:
Then I tried a 10 micro farad cap and I got the same type of wave form.
Finally, I tried a 1 micro farad cap and I was able got get a continuous wave form:
Some ' zooms":