Electrical Engineering ⇒ Topic : Tube Parameters
The following parameters are generally used:
Amplification factor μ
The ratio of small change in plate potential Δep to corresponding small change in grid potential Δeg at a constant plate current is called the amplification factor.
There is no unit of amplification factor. The significance of negative sign is that to keep plate current constant, the grid potential must be decreased for increase in plate potential and vice versa.
The plate resistance for the flow of direct current is different from the plate resistance due to the flow of alternating current
DC plate resistance: The ratio of steady plate potential to steady plate current is called DC plate resistance.
AC or dynamic plate resistance: The ratio of small change in plate potential Δep to the corresponding small change in plate current Δip keeping grid potential Δeg constant is called AC dynamic plate resistance
Its unit is ohm.
Mutual or transconductance: The ratio of small change in plate current Δip to the small change in grid potential Δeg keeping plate potential constant is called mutual or transconductance gm.
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