Measurement of the Chief Parameters of Triode Valves
William Henry Eccles · Proceedings of the Physical Society of London · 1919
At any given filament voltage or current the principal parameters of a triode are: - The co-ordinates of the mid-point of the straight part of the lumped characteristic. The voltage factor g. The differential coefficient di a /de a or h a . The differential coefficient di a /de g or h g . Methods of determining these quantities are described.