Electrical Engineering ⇒ Topic : Tube Parameters

Murli
 
TUBE PARAMETERS The following parameters are generally used: Amplification factor μ The ratio of small change in plate potential Δe_{p} to corresponding small change in grid potential Δe_{g} at a constant plate current is called the amplification factor. ............. (1) 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. Plate resistance 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 Δe_{p} to the corresponding small change in plate current Δi_{p} keeping grid potential Δe_{g} constant is called AC dynamic plate resistance ............ (2) Its unit is ohm. Mutual or transconductance: The ratio of small change in plate current Δi_{p} to the small change in grid potential Δe_{g }keeping plate potential constant is called mutual or transconductance g_{m}. ................(3)  
 
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