Power supply: DC 12 16V, current 1A or more. DC12V 1.5A supply power is recommended. Power socket: DC 3.5/5.5*21 Tube compatibility: Supports replacement tubes including 6J1 6J2 6J3 6J4 6J5 6A2 6K4 6K5 6AK5 6AU6 6BA6 6BD6 EF93 6K7 GE5654 etc. Tube: 6J3 (The tube is disassembled) Benefits and use scenarios Flexible power options Uses a DC 12 16V supply with 1A or more current, accommodating a range of simple user power arrangements. Recommended to use 12V 1.5A for stable operation. Broad compatibility Supports a wide selection of commonly used tubes, enabling variations and experimentation without needing hardware. Easy integration Standard DC power jack with compatibility for 3.5/5.5 mm connectors, facilitating straightforward integration with existing power supplies and setups. Clear tube configuration Uses tube 6J3, with the tube described as disassembled, ready for user handling or modification as part of a DIY or workflow. Practical applications DIY tube amplifier projects Ideal for hobbyists building or iterating tubebased audio or signal amplification projects using multiple compatible tubes. Electronics education and experimentation Useful in learning environments or labs to explore tube circuitry and tubetype substitutions without changing the core hardware. Vintage audio equipment maintenance and restoration Suitable for restoration work where 6J series tubes and related replacements are part of the process.