Thanks for reply all.
I have the equivalent drive level resistor. ?The procedure call for pre setting the IRF 510s to 50 ma each, and then adjusting the drive level pot until the increase in voltage slows down. ?This should occur at about 12 watts. ? Then back down about a half watts. ?Originally I was able to see about 15 watts if I kept going
but now that point seems to have dropped to about 10 watts, so I back down about 1/2 watt from there. (measured on a scope and then using formula)
I guess I have to start measuring voltages on all the transistors.
Andy
Km4TRT
