05-02-2014, 10:47 PM
I was about to pull a link from another site.
They replace the anode resistor with a silicon constant currant device removing the linearity problem caused by running low HT rails.
So why not use the FETs directly in class A and be done with it?
The valve in the circuit then becomes symbolic.
The idea is almost as stupid but with a little more common sense if the designer had a huge stock of variable MU pentodes and was told to use them all up in audio circuits. The currant regulator would make them linear to some extent maybe?
They replace the anode resistor with a silicon constant currant device removing the linearity problem caused by running low HT rails.
So why not use the FETs directly in class A and be done with it?
The valve in the circuit then becomes symbolic.
The idea is almost as stupid but with a little more common sense if the designer had a huge stock of variable MU pentodes and was told to use them all up in audio circuits. The currant regulator would make them linear to some extent maybe?
