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: frank.pocnet.ne...
Doug Ford's Microphone design series: • Microphone Technology ...
Reverse Engineering How-To video: • EEVblog #675 - How To ...
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