Specific parameters:Model: 1969 Small Group ATube Model: TIP41COutput : 5W per channel consumption: 20W per channel source: DC single 12-30VStatic current: prior to shipment in a standard 25 volts DC down to 08-09ABoard size: 5 * 5cm/197*197 inchThickness: 16mm fiberglass board double-sided designBoard material situation:: full five-color ring precision metal film resistorsAdjustable : Sealed multi-turn adjustable resistorsInput capacitance: Promise of capacitance FarahElectrolytic capacitors: high-capacitanceSpecific wiring methods: 1969 finished panels and audio speaker wiring diagram. material:plasticcolour:greenPackage Included: 1x DC 12V 1969 Class A Amplifier Board2x Thermal insulation pads2x insulation capsNote: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.