Re: Kolster-Brandes MR10
If measuring the grid voltage it should be measured between grid (pin2) and cathode (pin3), not chassis.
The result should always be negative with regard to the cathode.
You can also measure the voltage across the cathode resistor, (cathode to chassis), that will normally be the same as the grid voltage but it will be positive with regard to chassis.
Knowing the voltage across the cathode resistor will enable you to get a rough indication of the current through the valve..
Mike
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