Great condition for its age are (2) PS Audio Two C vintage amplifiers. Each amplifier comes with external power supply for low noise operation. Power supply alone weighs approximately 10 pounds. No previous modification or service has been done since I've owned them. Class AB Stereo mode - 2 x 55 watts into 8 ohms Mono mode - 1 x 200 watts into 8 ohms Mono mode - 1 x 400 watts into 4 ohms PS Audio is an American company specializing in high-fidelity audio components equipment for audiophiles and the sound recording industry. It currently produces audio amplifiers, preamplifiers, power related products, digital-to-analog converters, streaming audio, music management software and cables. *** $250.00 each amplifier if sold individually ***