How do you calculate a vacuum tubes plate current?
Answer:
It depends on the circuit of course.
You'd need to know the plate voltage, grid bias and then look at the characteristic curve graphs.
Or you could just stick a meter in the anode circuit.
turn switch to "on".....on the Hoover!
At what archaeological dig did you unearth a vacuum tube device? Didn't they use those for building the great pyramids?
It's the operating plate voltage divided by the load on the plate circuit.
You can get the operating plate voltage from the characteristic curves for the tube using the grid voltage that is applied and the value of the plate load resistance.
What Matt D said.
The only thing I will add is... it is much safer to measure it by measuring the cathode current, than connecting a meter in line with the anode. Since the grid currents are very very small compared with the anode current, the cathode current is, in effect, the same as the anode current.
You can even place a small (shunt) resistance in series with the cathode (like1 Ohm) and measure the voltage across the resistor to get the current.
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