Circlotron Amplifier ...Cathode output typology for nice matching w SPK

   

Triodes tube 6C33 Cathode output

Pentodes tube EL34 Cathode output

 

The Amazing FET Circlotron

                              https://www.youtube.com/watch?v=tzhZg_IbFe8

BAT（Balanced Audio Technology） VK-55SE

6C33 inside