The anode to grid electron acceleration resistor in all recent microphone amplifying tests of the V6 is 6 Megohms. Not 8 Megohms as incorrectly stated.
Anode potential is 3.9 volts.
When heater voltage is 3.9V, grid bias is -72mV and anode current is 105 microamperes.
When the heater is disconnected and Ia reaches 50uA, the grid bias is -300mV. The EF183 electron tube sounds great at these conditions.
When the cathode temperature is so low that ia=40mA, Vg=420mV.. Again positive value but the tube sounds great.The heater voltage is 2.5V.
The electron tube is rated at heater 6.3V. This is pressumably more important when the tube is operated with hundreds of volts at the anode?
References:
Pleiades V6 schematic
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