The Philips 22AH309 is a very compact power amplifier with 2x 55 watts of power and connectivity for two separately switchable pairs of speakers. This power amplifier completes the compact "X09" Hi-Fi set and offers fantastic sound quality for its modest size. Solid state design Idle and offset set correct. All solder joints inspected and re-soldered. Year of manufacture: 1980 Power output: 50 watts per channel into 8Ω (stereo) Total harmonic distortion: 0.05% Input sensitivity: 0.8V Speaker load impedance: 4Ω to 16Ω Dimensions: 260 x 100 x 183mm Carefully insured shipped.