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Never too many tubes: 17 tubes to drive a pair of Stax headphones, including 3 rectifiers, 2 regulators, 3 gain stages, 12AU7, 12AX7 (using 5751's), EL34.... even in relatively simple amplification designs!
The coupling caps are accessible for rolling. This version runs at 500V. Two pairs of EL34 for OTL output. Two pairs of EL34 as CCS. One transformer for filaments, one transformer for voltage rails, two transformers as power supply chokes.No transistors in the signal path. One transistor step downs the voltage from 500V to 300V for the first two gain stages. The other transistor helps set operating voltage for the EL34's.