Hi Brad,
Thanks for your post, nice to hear from you. I see your state is very important in the primaries!
1.) Can I use a full wave rectifier instead of the four IN4007 diodes?
2.) If so, what volt/amp rating?
3.) What is the output impedance of the TLP?
4.) Changing over to a stepped attenuator. What value do you recommend?
Good news, the configuration of the four diodes is in fact full wave!! I prefer this above all others.
The rectifiers used are 1A continuous, 10A surge, 600 PIV.
Zout is recip gm of the tube, which is around 130R.
I recommend a 20K, or thereabouts. This is well handled by the SS section of the most sources, and gives low noise.
Hope this helps!
Cheers,
Hugh