Thank you very much for the tip!
Probably will be better to use an half-bridge with a voltage doubler to keep it simple!
In addition in the push-pull setup is more difficult to keep low parassitic inductance, that results in higher voltage spike. 

I will make some test and i will report the results

Hi all,
I had a good experience with a small SSTC based on tefatronix's schematic (push-pull configuration driverless) where I obtain 7-8cm of spark with a 24V supply, now I would like to try to build a little bit bigger teslacoil to obtain spark near 20cm

The main idea is to use a 440VA 53VAC trasformer that I have in laboratory. I would like to explore an alternative configuration respect the usual half/full brige.
What do you think about a push-pull configuration with the mosfet drived by a couple of UCC37322/37321? In this way it is not necessary a GDT and than the feedback will be taken from secondary with a small transformer plus two schmitt inverter. In addition the push-pull configuration, like the full bridge "double" the voltage.
The other advantage is that theoreticaly it is not necessary to bias the mosfet because the system will start "automatically".

The coil will have a very low primary inductance to have an high peak current combinate to a low duty-cycle to have a ​low mean power and an high pulse power. 

Hii,
I have finished the schematics. What do you think? Can work?

Thank you very much!

Thank you very much!
I try to implement all and then I will post the schematics!

Hi all,
I would like to realize a little DRSSTC, the idea is to obtain longer spark from the SSTC that I have developed in the post in SSTC section.

I have two secondari coil: one with a resonance frequency arround 1MHz and the other probably in the range of 400kHz, but I can measure precisely the resonant frequency of the coil with the Analog Discovery 2.

I will supply the coil with a 30VAC 150VA transformer or 50VAC 500VA transformer that I have.

I am thinking a full bridge with IXFP76N15T2 mosfet.

The idea is to have the simplest possible drivers, now I am drawing the schematics.

A questions, I should use primari o secondary feedback or antenna feedback? The overcurrent detector is mandatory or not?

Thank you very much in advance for your time and help!

Hi all,

The minitesla still working   
Now I would like to do a PCB to minimize the parasitic inductance!
Instead of driving the mosfet with the feedback transformer, can I use a gate driver ic like the UCC27425?

I would like to try to do use this system: https://www.loneoceans.com/labs/sstc2/sstc2schematicv10.jpg but to drive the push-pull configuration. To reduce the number of components

In addition I have realized the configuration in the link with a bigger coil, but with a 50W transformer (24VAC 2A) I obtain only spark of about 3-4cm. Probably due to the low input power

The thermal paste and the heatsink is not sufficient in some case, expecially when you use short pulse duration but with high current (low mean current).
You should check also the thermal impedance.

I have just ordered the board from PCBWay for the driver. I hope that all works good xD
In the next day I will post the complete schematic

I would like to make some changes in the driver.
I have found a 440VA 53VAC transformer that I would like to use for the next teslacoil.

Therefore VDC will be +- 75V (that can reach +-90 without load), therefore I have choosed a mosfet of 250Vds ->  IRFB4229
With a very short and semplified thermal calculation, result that can handle about 55A with the interrupter set to 20Hz and duty-cycle of 5% (Setted as worst case).

I would like to have the same carachteristic of the small coil with an high peak current and a low duty-cycle to have an low mean power and an high pulse power.

Thereticaly the small teslacoil have an peak current of about 30A, with a 24V supply and a push-pull driver will results in a 30A*24V*2= 1440W (peak power) and an average power of 40W. The results is about 7-8cm of spark.

Therefore the average current will be about: 55A * 0.05 = 2.75A with an average power of 75V*2.75 = 206W. And a Peak power of about 75V*55A =4125W

Therefore we will have a 4x power therefore I will expect a sparklength in the range of 30cm. Can be correct?

Very good!
Geogebra is a good software. I have used it during the Bachelor for the mathematics and physics

Why in the big teslacoil is used almost always a flat spiral for the primary?  To maximixing the distance between the primary and the secondary and to not have a too high coupling?