I'm using the design in this picture:

but I have ditched the original phase splitter circuit for a totally different one I'm working on.
I really have just 8 6L6GC's connected to a power transformer and like 500 switches

I am gonna probably run it at like 800V or a bit more to utilize every bit of those pentodes.
also, I wanted to use fixed bias (grid bias) in this circuit but I don't think it would work properly. I mean putting a negative bias voltage on the lower tube grids yes. but would doing the same thing to the upper tubes would need a different bias voltage. but now thinking about this more I won't need a voltage that is negative from the ground since the cathode for those tubes is at like 300+V.
also, I intend this for a guitar amp and probably gonna use only 4 of those tubes, I just had too much excitement seeing the price of the Russian 6P3S (not sure if that's right)
basically the Russian equivalent of 6V6GC.
also, I had the idea of driving the grid from 6P1P (EL90) pentodes just cause

I guess the more I talk about it the more it turns into The "Unnecessarily Complex 300B Amp" or something similar.
EDIT: upon further googling, it seems that the 6P3S Russian "6L6GC" equivalent is actually the equivalent for the 6L6 not the GC.

I guess I'll have to like with 6L6's not GC's