> On my grounded grid, cathode driven 3CX3000F7 linear with 4800 volts on the plate my zero signal plate current is 500 mills. Should I be adding a little bias to bring it down a bit? > 73, > Ken W2DTC Ken...I would bring it down to c. 350 ma. This will reduce the heating of the ham shack, and be right on the Eimac recommended ZSAC for 4800 volts Ep. (((73))) Phil, K5PC