Hi, I have an IRFBF20 and 5 off 7N80, first has Vgs of 10v whereas the 7N80s have Vgs of 30v so likely more suited. The blocking cap might be a good solution as you say, then I could be a "Trimpot Trev" and adjust the bias, or the other potential lazy way I was thinking of finding out the resistances needed was to assemble the basic circuit from the other forum with ballpark resistances but using the 7N80 & employing Al's source-gate Zener. Then using a solid state rectifier bring the set up slowly and monitor the circuit & adjust resistances as required.
I definitely have a lot to learn as far as making silicon work where there ought to be vacuum! No huge rush though, I've a resurrected RG73 with different rectifier and output valve to be playing with in the meantime
It's starting to work rather well now but was a lot simpler as it's still all-valve!
EDIT- and Jeffrey, I'll have a look at that & see how it's behaving. Be interesting to see how it's handling it.
Thanks again, Dan
I definitely have a lot to learn as far as making silicon work where there ought to be vacuum! No huge rush though, I've a resurrected RG73 with different rectifier and output valve to be playing with in the meantime
It's starting to work rather well now but was a lot simpler as it's still all-valve!EDIT- and Jeffrey, I'll have a look at that & see how it's behaving. Be interesting to see how it's handling it.
Thanks again, Dan
