I bought this new driver witch is called IR4427 seems very good, it is also easy to find, you can drive with only one mosfet or in half wave bridge mode.
(this has an inverting and a non inverting output)
you should have a 100 ohms resistor between the gate of the transistor and the driver output, and a variable 5kohm variable between the gate and ground so you can adjust the mosfet transconductance (on resistance), to not simply turn it to maximum on. (controlling the current or input impedance)
Maybe simply adding a capacitor in parallel with tx5 will be fine, however i think that the electric fields in the water bath would benefit if the capacitor is actually the container. Even the self capacitance of the coil could get it to resonance but the frequency would be very very high.
By the container capacitance i mean that being the container a dielectric and water a conductor (also dielectric) ( and being inside), If you just provide another electrode around (outside of the container) you form a second capacitor. (simple kitchen aluminum foil). Than you have the capacitance of the tubes ok 1,8nf and that of the container that will be in the pico to nano faraday range depending on the volume of water and the size of the electrode around the container (virtual isolated ground). (i think that as water is conductive to a certain degree, the only thing that matter is the volume of water and the size of the outside electrode.
I'm using now irfp460 mosfets, but i'm also planning to use tip3055 cause is bipolar and faster thus..
I think that if we want the driver to drive a bipolar we should make it in stages, maybe first one having a 5kohm resistor between the driver and the base and thereon reducing gradually in the following stages to have the desired current. I think that this approach is far better than my irfp460 cause the speed of switching of this transistors. I'm going to make everything modular so i can change things like power supply, the vic, the chokes...
In the vic impedance network you see that he show the coils having a capacitance in parallel with them, witch can represent interwinding capacitance but can also represent what i'm proposing cause giving his own words, electrical insulated housing...insulated ground..., and his drawing of the earth reference in the drawing in the patent only confirm where my guess is going.