The power-factor and capacity of the electrodes and base of triode valves with special reference to their use in thermionic voltmeters
George W. Sutton · Proceedings of the Physical Society · 1927
The Paper discusses the conditions under which a three-electrode valve-voltmeter should be operated to ensure a minimum power consumption, and at the same time to give indications closely proportional to the square of the input voltage. A simple method of adjusting the operating voltages to fulfil the necessary conditions is described.