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|15th October 2012, 11:04 PM||#21|
Join Date: Dec 2008
Seeing this response was a good moment. I think it puts many things together.
for a tube - the small signal parameters are as follows
........................ mu = gm x rp
where, mu is the maximum theoretical gain for a particular tube.
and rp is the plate resistance
for the common cathode amp above, Rp is connected in the circuit, so substitute Av for mu - without a load, the gain is as follows.
........................ Av = gm x rp//Rp
However, a switch could be connected in series with a load resistor - Rs.
Measurements, could be taken - switching the load resistor in and out.
so with a load resistor
....................... Av = gm x rp//Rp//Rs
Last edited by Uunderhill; 15th October 2012 at 11:17 PM.
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