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: Reverse Engineering How-To video: Forum: EEVblog Main Web Site: The 2nd EEVblog Channel: Support the EEVblog through Patreon! EEVblog Amazon Store (Dave gets a cut): T-Shirts: Donations: Projects: Electronics Info Wiki: 💗 Likecoin – Coins for Likes: @eevblog/dil9/hcq3 Теги: reverse engineering,how to,tutorial,xuanzu,x2-u808,hi-fi,headphone,audio,amplifier,review,teardown,testing,thd,noise,valve,tube,design,triode,pentode,e180f,6j9,datasheet,measurement,doug ford,analog,common cathode,common emitter,common source