> Some of you are getting confused between the difference of the
> the impedance between the elements of the TUBE and the impedance of the
> complete
> circuit. He is referring to the grid to cathode impedance of the TUBE.
> The cathode to ground impedance of a grounded grid amplifier involves
> the cathode grid and the plate. This is quite different than the grid
> cathode impedance
> of the TUBE.
We aren't confused, obviously he didn't tell us what he was thinking about,
just like my XYL (wife) 90% of the time.
>> > Grid to Cathode impedance of a tube
>> > is the grid to cathode voltage divided by the
>> > grid current!!!
>> I wouldn't be so quick to say that. Nothing is that simple.
>> The load on a grounded grid amplifier is seen by the amplifier's
>> driver.
>> (I assume as long as the GG amplifier is drawing plate current)
>> A good percentage of the driving power winds up in the grounded grid
>> amplifier's load.
>> You drive the cathode, the cathode is connected (through plate
>> current) to the plate of the tube that is connected through matching
>> networks etc. to the load.
--
Ron KA4INM - The problem with socialism is that eventually you run out of
other people's money.
[Margaret Thatcher]
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