output impedance in shunt reg sim

[dadod]

The +ve supply models differently from -ve supply.
It's that difference that I am asking about.
Does the Nchannel in the -ve supply account for some, or all, of that difference in polarity performance?

That is just simulation, I used IRF640/9640 or IRF540/9540 in real PS, but you know that there is not perfect complementary BJTs or MOSFETs. I did not measured the output impedance in real PS, but for sure there are some insignificant differences between + and - output.

 

[doors666]

Made a pcb design.

schematic -

schm by doors666, on Flickr

top layer -

brd-top by doors666, on Flickr

bottom layer -

btm-brd by doors666, on Flickr

I have kept some of the resistors high wattage to make it work with higher voltage supplies also, I need one for a tube pre B+ of about 100v also.

Please let me know if something can be improved in this.