Thoughts on Audio Research D70

No worries hifigeek1 I removed the 2 6FQ7s (V4V5) which are the capacitatively coupled bottom tube of the 4 triode criss cross diffamp driver subcircuit so the net filament draw of this new config is 1 pair of 6H30 vs 2 pairs of 6FQ7 ie 30% lower than before.
The 4 6FQ7s previously shared the same 6.3V AC filament winding.
My amp now runs with 2 less tubes and 4 less coupling caps than stock,
6922 phase-split->cap->6922 gain->6H30->cap->KT88.

I think you mean cross couplers? So insted of using 2)6FQ7 per channel you are using one 6922 and a 6H30 as the driver. The input tube remains a 6922. What are you setting the plate deferential voltages to? I believe with the 6FQ7, now a 6922, it was 75V matching from plate to plate. What percent THD are you getting?

yes and yes.
6922 plate remains 75V as prescribed.
I did not change the 1 1/2 6922s for each channel.
Just REMOVED the first 6FQ7 and reconfigured the 2nd as common cathode.
Note that in the orig circuit the 6922 with plate = 75V is directly coupled to the grid of the 2nd (driver 6FQ7 anyway)
6H30 plates are now 280V (B+ still 455V)
I can send you a spice file.