DIY KIT Project To complete this project, high level knowledge of electronics and rich experience in terms of soldering and testing are required. Due to time zone and language communication restrictions, we can only provide limited technical support, and you need to solve problems by yourself. We do not provide information other than the product introduction page. MOFI-EMP-Tube-Headphone Amplifier-DIY KIT Project Compared with the commonly reproduction of EMP, we improved: 1、High Voltage：Two-stage buck regulator filter, Two low-pass filter (with a corner frequency of 1.6Hz&16Hz) prevents power noise from being introduced into the amplifier. Provide purer power supply (close to battery). 2、The high-voltage power supply uses MOSFET as pass transistors, which have a sense of tube sound characteristics but rejecting the rectification and regulation noise. 3、high-voltage soft-start feature is included which will take about 5 second to reach the designed voltage protecting the tube from any voltage shock. 4、Using parallel AC heater power supply, the voltage distribution is more accurate, better than the original deign which is series voltage regulator. 5、all-in-one design, single-point grounding, ground resistance is close to the 0.02 ohm resistance value, low noisedesign. 6、PCB is Small with double-sided smt. 7、The triangular tube layout reduces the number of dual-channel common tubes, further improves the separation and reduces crosstalk. 8、More cost-effective sound modification plan. PCB SIZE: 102X152X1.6mm Power requirements: heater volt: AC 6.3V,I≥1.2A Best:6.3VAC@2A high volt: AC100~260V,I≥0.04A best:120VAC@0.1A DIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer and the electronic tube. Package：1pc EMP-Tube-Headphone Amplifier-DIY KIT