Build of OTL tube (valve) amplifier

This is my attempt to build an OTL tube amplifier according to the Japanese scheme. I used, NOS Soviet electronic tubes, the output tubes are 6N13S (6H13C) replacement is 6AS7, 6AS7GA, 6080 ..., the drivers are 6N6P replacement is 6CG7 ... and the preamp is 6J4P replacement is 6AU6.
As the amplifier I use for the drive and headphone, voltage filtering must be exceedingly good, without a choke the filter capacitors must be significantly bigger. I had to perform the power supply of the preamp heater with DC power supply, otherwise it has too much noise (too compact design or is it a matter of electronic tubes?).

Download link for schematics, LTspice model (OTL 6N13S.asc, tube.inc), photos:
https://drive.google.com/drive/folder...