You are looking at special order made amplifier, made by Morikawa. It uses 6B4G as power tube. 6B4G is nearly same as 2A3 tube, just heater is different (2.5V). Because there is 3V tab in power transformer so you can easily change to 2A3, just make some small modification.
Power transformer has 110V tab, so you can change wire to use it in 117V in America.
All transformers are Luxman made. Prestage and secondary stage 's heater is separated set with UTC transformer.
Prestage and secondary stage is 6ZDH3A SRPP connection, drive 6B4G tube.
Amplifier was maintenance before listing by Otomon Laboratory, you can easily search this lab in internet. Perfect working condition, no noise , no hum. Sound is very beautiful. I will include schematic in case buyer need.
If item arrive and not working, I accept return for refund but buyer pay return shipping fee in any case.