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Try irf540 or bigger power mosfet, but looking at your picture it works well. Don't wind more than 400 turns. What is the performance of your power supply?
Yes, you can.
Adjust the pot between gate and source to minimum (between gate and 50 ohm to maximum) and increase it slowly when a small plasma flame appears. That's the correct adjustment. With a large heatsink, during adjustment, I did not burn the mosfet.
First, the pot between gate and source must be set to minimum resistance, then slowly increase it until small plasma flame appears on terminal. wneh the plasma is the longest, it is the proper adjustment. Don't run the device long time with inproper adjustment, and use a large heatsink. I have no problem with irf540
Try it, if it will not work, build a simple voltage doubler.
I think you have to rewind them this (or similar) way.
Yes, but I have only this type of mosfet, and unfortunately I have no stronger power supply.
This is a slayer exciter circuit. I think when audio is attacded to the gate, it confuses the operation of the circuit.
Audio tesla coils are more complicated circuits. You can try it by modulating primary current or run this sstc from a power amplifier, but these are not the best solutions. Audio fidelity will not be very good.
To test operation, place a small neon glow lamp or a compact fluorescent lamp close to the secondary, in case of oscillation, it will glow. Plasma corona not always appear at the top of the needle.
Yes, diameter is not critical, but you can use glass, bakelite tube etc. any other material that not melt because secondary coil gets very warm, almost hot during operation.
Hi! Sorry, I know I reply late, but I was busy recently. 51 ohm will work well. Doesn't matter what is the direction of the secondary, if there is no oscillation, change the polarity of the primary. It's easier. First, try with 200-300 turns on a cardboard tube. Power supplies between 20 and 40V will work. My power supply is a small, 20W transformer from a satellite receiver, a rectifier bridge, and a filter capacitor. Good luck!
I don't know, try it. If it will not oscillate, change the primary (1 turn). If it still not oscillating, decrease the secondary to 400 turns. 48V will ok, but be careful not to draw high current or use a big heatsink! It did not try it with interrupter.