Now seems that i could put the circuit to work better, the diode in parallel with the primary now has 1kohm resistor in series!!! without it the transistor didn't worked so well. And is not perfect yet, but at least can get up to 50 75 v without the 120hz behind. Now only 100ma flow...
My oscilloscope wasn't working again (burned resistor of one chanel) already changed.
so the primary now has the correct orientation in relation to the bobins.
I could get up to 200 volts in the tx5 (i have no secondary connected yet... i was applying around 50v 100ma to that primary, the coupling seems to be low.
I don't know what is happening, when i raise the voltage the frequency gets dirtier.
I'm now using irf840 it runs absolutely cool for now. Up to the point where the snubber capacitor blows... The good thing is that the mosfet now is not burning since i started using the diode in parallel with the primary, but it was not good cause was blocking the resonance, and also making the transistor to behave strange, so i added a resistor in series with this diode and so both resistor and diode are in series, wired across the primary. .