[Amps] Novel Screen Grid Regulator

[Paul Christensen]

Jim,

Very interesting circuit since the MOSFETs function like a high-power, 
active voltage divider.  I did note that the non-inverting input to U1a may 
be susceptible to the effects of both the normal screen voltage and perhaps 
a flash from the screen.  However, provided that Z1 acts quickly enough and 
R10 remains intact, then concern is probably minimized.  Still, it may make 
sense to Zener-clamp the non-inverting op-amp input to a level just above 
the value found in normal operation.  Then, if adding Zener-clamping, I 
think it would be a good practice to add series R at the non-inverting input 
of 1K.  The input Z to the non-inverting input of the LM358 is quite high, 
allowing for some additional series R protection.

Paul, W9AC