Specifications Circuit Board Dimensions 100 x 80 mmOuter Dimensions without case 110 x 90 x 40 mmOuter Dimensions with case 215 x 132 x 55 mmCircuit Board Material Double Sided 1 2mm FR 4 BoardPower Supply Voltage AC Dual 12VWeight Without case 122g With case and amplifier 850gSignal to Noise Ratio 105dBAmplification Factor Approximately 0 8x earphone output supports high sensitivity headphones Supported Devices Compatible with MP3 players mobile phones tablets and computersNote This is a DIY kit you need to assemble and solder Features 1 High Fidelity Sound OutputEquipped with 6J1 vacuum tubes this amplifier delivers clear natural audio output ensuring a premium listening experience for audiophiles 2 Wide Device CompatibilityCompatible with various devices including MP3 players smartphones tablets and computers making it suitable for multiple use cases 3 Upgraded Circuit Board DesignUtilizes high quality FR 4 double sided boards ensuring stable operation under diverse conditions for enhanced signal performance 4 Optimized Amplification FunctionEarphone output supports high sensitivity earphones and can drive certain advanced audio systems providing versatility in audio usage 5 User Friendly StructureCompact design with clear casing allows easy assembly and visual interaction with internal components appealing to DIY electronics enthusiasts Package Included 1 x HIFI 6J1 Tube Amplifier DIY Kit The other items are not includes for referenc