Common grid tube amplifier

[keith1200rs]

Htg,

I think you have already got some comprehensive replies. I was going to just apply my simplistic approach which is that fixing the grid and varying the cathode is not much different to fixing the cathode and varying the grid. The two main differences are the lower impedance of the cathode and that grounding the grid prevents Miller capacitance and so dramatically improves bandwidth.

Keith

 

[htg]

Thanks, now I believe it works and I know why it makes sense to use it. (Before I didn't understand common grid/gate/base amplifiers).

 

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yes run problem

i have build a long time a VHF power amplifier with a triode Thomsom 6007

power out > 500 WATTS in 144 Mhz

similar to this : https://www.youtube.com/watch?v=67JpnLYPR3o

or

https://www.sixitalia.org/jv10/inde...made&id=637:th6007-thompson&Itemid=91&lang=en

look the grid is connected to ground with the 3 screws visible ( one masked )

6 * F