EEVblog #837 – Reverse Engineering A Valve Headphone Amplifier

Dave reverse engineers the XuanZu X2-U808 Hi-Fi Headphone Amplifier to see if the valves actually do anything.
What is the circuit topology?
E180F (6J9) pentode valve datasheet
Doug Ford’s Microphone design series Playlist
Reverse Engineering How-To video
Forum HERE

https://www.youtube.com/embed/coSt5HWRvv4?version=3&rel=1&fs=1&autohide=2&showsearch=0&showinfo=1&iv_load_policy=1&wmode=transparent

from EEVblog – The Electronics Engineering Video Blog http://www.eevblog.com/2016/01/07/eevblog-837-reverse-engineering-a-valve-headphone-amplifier/