The McIntosh MR500 is a tuner unit manufactured by McIntosh Laboratory Inc., a prominent American audio equipment company. It was part of their lineup of high-quality audio components and was designed to receive and tune radio broadcasts. The MR500 features a solid build quality, retro aesthetic, and is known for providing excellent reception and audio performance. It offers a range of tuning features, including AM and FM radio bands, as well as preset station memory. The tuner also has a large analog tuning dial and a digital frequency display. However, specific technical specifications such as frequency range or sensitivity are not available.