Gate voltage


Newbie question here. I read that the IRF510 gets unstable and breakdown at 3-4 volts.

When setting RV2&3 to 100ma each , when i check the gate voltage it is 3.60 and 3.99-4V(2 different irf510 mosfets), amps are about 1.6A @100ma for rv2&3
 on a tone

Should I drop the RV2&3 down so as gate voltage is 2.5v, however I only get 50ma on PTT, but a loud bellow results in  1.3 amp draw.



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