Hello Brian,
Found out you had a new forum so I add the same question as in your old.
Bought your TVCs about a year ago and they work splendid.
Got the idea to rebuild my 6N30P parafeed preamp with fixedbias through the TVC.
Technically/theoretically it shouldn´t be any problems as long as no grid current is drawn.
Do you see any?
Brgds
Lars