Gentlemen,
I strongly urge you to do some reading on 12AX7 tube spec regarding Max heater to Cathode Voltage.
The spec says 100V.
SRPP based configuration calls for a raised filment to avoid this stress.
Jolida does not have raised filament, just an AC supply with a grounded (vs raised) center tap.
Your prized vintage tubes will have one triode in each tube aging real rapidly.
The $$$ wasted on premium vintage tubes can buy you properly designed amps.
I strongly urge you to do some reading on 12AX7 tube spec regarding Max heater to Cathode Voltage.
The spec says 100V.
SRPP based configuration calls for a raised filment to avoid this stress.
Jolida does not have raised filament, just an AC supply with a grounded (vs raised) center tap.
Your prized vintage tubes will have one triode in each tube aging real rapidly.
The $$$ wasted on premium vintage tubes can buy you properly designed amps.