This power amplifier is not a finished product, finished product reference picture, with empty printed circuit board, includes complete accessories, needs to be welded and debugged by yourself. The heat sinks are not provided. Reasonable circuit layout, adopts fine-quality power amplifier chip with high operating efficiency, and this circuit can deliver truly high-end sound quality. Circuit for class AB linear amplifier for SSB AM CW frequency modulation power amplifier. For low-power radio power connectivity. For FT-817 KX3 and other small power radio. Features: Reasonable circuit layout, adopts fine-quality power amplifier chip with high operating efficiency, and this circuit can deliver truly high-end sound quality. The sound is clear and comfortable, stable quality design, with low power consumption, low heat generating and long service time. Circuit for class AB linear amplifier for SSB AM CW frequency modulation power amplifier. For low-power radio power connectivity. For FT-817 KX3 and other small power radio. This product is not a finished product, finished product reference picture, empty printed circuit board, includes complete accessories, needs to be welded and debugged by yourself. Warning: The output is prohibited open circuit, short circuit, prohibit VSWR 2.0 or more. Specifications: Name: Power Amplifier DIY Kit Material: printed circuit board+metal Voltage: 13.8V Current: 6-10A Maximum input power: 5W Maximum output power: 70W Frequency ranges: 3.5-30Mhz (10M-80M) Air-cooled: fan forced cooling Package size: 155 * 105 * 41mm / 6.10 * 4.13 * 1.61in Package weight: 116g / 4.09ounce Packing List: 1 * Power Amplifier DIY Kit