Circuit is 6sn7 voltage gain, the el84 cathode follower direct to 211 grid, in a similar fashion to Ongaku. The A2 driver is capable of sending the grid at least 40v positive, so peak power is just above 30w.

 

All transformers by Sowter Transformers

 

211 DC heated using TentLabs units.

 

At 1w the frequency response is 10hz to 37kHz at -3dB, 20hz to 24kHz at -1dB