Input is 300 V.D.C. and we want 150 V.D.C. Vacuum tube GE 7355 can be used. Put 300 V.D.C. on anode and output from tube cathode pin at 150 V.D.C. and not have to use high wattage voltage divider.
Note component ratings. 150 k resistor is 2 watt, 50k adjustable ( tube grid connection) resistor is 4 watt, 100 k resistor is 2 watt, 1 k resistor is 1 watt, with 0 to 200 volt D.C. range on voltmeter.
Tube heater circuit 6.3 volts at 800 milliamps is not shown.
