>The 2sj79 drives the cathode. This is grounded grid drive. Way more linear than common cathode with input signal at the grid.
>Output from the plate.
The characteristic curves change depending on which port the input signal is applied to? News to me...
Common grid is used to avoid the so-called "Miller capacitance" where the interelectrode capacitance is amplified by the amplification factor.
Edited by sorabji - 10/1/12 at 5:54pm