This is prototype 6J1 (6AK5) triode connection drive 6P15 (EL83?) trideo connection. The 250V B+ is powered by the adjustable power supply i make(meter show 25.1V actually is 251V).. and Filament is powered by HP6114A . I was calculated by curve it suppose to deliver 1.2Watts , During testing it very loud doesn’t sound like 1.2Watts the bass is very strong, Unfortunately my phone microphone can’t capture the true sound in this video. This is just prototyping to see how everything work before i make the PCB and get the frequency bode plot add Negative feedback. Hope you enjoy this video , thanks for watching.
Video : https://youtu.be/N8aR_eaFi2s
GeeSeang's Hobby site 