Hello! I am trying to design some schematics for my r70xa. I have some tubes on hand and was thinking of doing a push pull OTL, since I will need some good drive for these headphones having an impedance of 470ohm. I have some tubes on hand already. Most of the ones that I have are: 12AU7, 6AU6, 6AU8, 6AU6A, 6AU8A, 6BA6, 6AW8A, 6BA8A, 6BC4, 6BC5, 6BC8, 6BD6. I know a lot of these are mainly used in TVs, so don't know if they would work in an audio project. Maybe I could use any of these as drivers and buy output tubes? Any thoughts appreciated, thanks for looking.
Have a look at these, maybe will give you some ideas:
https://wtfamps.com/papa-rusa-headphone-amplifier/
https://headwizememorial.wordpress.com/2018/03/20/the-morgan-jones-mini-tube-headphone-amplifier/
https://headwizememorial.wordpress....e-ended-otl-amplifier-for-dynamic-headphones/
https://headwizememorial.wordpress.com/2018/03/20/a-low-voltage-class-a-tube-headphone-amplifier/
Cheers
Stan
https://wtfamps.com/papa-rusa-headphone-amplifier/
https://headwizememorial.wordpress.com/2018/03/20/the-morgan-jones-mini-tube-headphone-amplifier/
https://headwizememorial.wordpress....e-ended-otl-amplifier-for-dynamic-headphones/
https://headwizememorial.wordpress.com/2018/03/20/a-low-voltage-class-a-tube-headphone-amplifier/
Cheers
Stan