good evening !!! I plan to assemble your circuit for 6f12p 6n8s and 6p36s. tell me, did you do any measurements ??? or the whole setting was reduced to setting quiescent currents. and everything else by ear ??Ok. One more update to the design.
I added an RC filter to the main power supply. This reduces ripple to ~8mV.
I also cleaned up and corrected the main schematic. The grid stoppers are in the right place now, and the values are correct.
I rewired the entire rack today, and chased some hum away in the process. Results!
Koda
For the latest design and information see this thread: https://www.diyaudio.com/community/threads/modular-amplifier-1.375206/
Thank you very much, I have not seen the circuit using LEDs, we will try, though I have a voltage just above 385 volts, it turns out to be 6P36C or 6P45C lamps and 530 volts to the driver and a phase -inverter,
English please.
dave

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