Power supply and tube compatibility description Power input requirements: DC 1216 V, current rating 1 A or more. For results, use DC 12 V with a 1.5 A supply. Tube compatibility: Supports replacement tubes including 6J1, 6J2, 6J3, 6J4, 6J5, 6A2, 6K4, 6K5, 6AK5, 6AU6, 6BA6, 6BD6, EF93, 6K7, GE5654, etc. Power connector: DC barrel jack compatible with 3.5 mm or 5.5 mm plug, 21 mm length. Tube configuration: Tube: 6J3, tube disassembled. Key benefits and use scenarios Flexible compatibility: Wide range of common replacement tubes allows you to adapt the unit to different tubebased devices and experiments without changing the power source. Easy integration: Designed to operate from a DC supply in the 12–16 V range, making it suitable for compact DIY audio projects, hobbyist setups, and experimental rigs that require a stable lowvoltage tube power source. Practical flexibility: The disassembled 6J3 tube setup enables easy inspection, maintenance, or during assembly or testing. Use scenarios DIY tube audio project: Use as a reliable DC power source for tube preamps or small tubebased audio circuits that require 12–16 V and a flexible tube compatibility. Replacement power for vintage gear: or power vintage tube equipment that operates on a 12–16 V DC supply with a single, adaptable power unit. Tube experimentation and learning: A convenient platform for testing different 6J family tubes (and compatible types) in a single power supply, aiding educational projects or prototyping.