Sorry, your schematic is hard to read as is, please redraw it using standard tube symbols and "all in one", not criscrossing all over the screen from PCB to PCB.
And your supply arrangement is way too complex and heavy; try toget a proper transformer or even salvage one from an old tube radio or record player.
Do you have the proper sockets for "U Technology" tubes?
If I remember well, those are miniature 8 pin tubes (not octals) with a raised glass dot on the envelope to serve as an alignment key, not too easy to find today.
If you pulled tubes and sockets from an old radio, also reuse its power transformer (and presumably theoutput one too)
I presume you are somewhere in Europe.