This listing is for a PS Audio 4.5 stereo preamplifier. This all discrete preamplifier was handmade in the USA. It has a phono stage with loading for MC or MM cartridges. There are four line level inputs, two main outputs and two recording outputs. This preamp offers a straight wire (no gain) mode and mono mode in addition to the standard high level stereo output. The preamp is in excellent cosmetic condition with minimal signs of wear. The 4.5 was built for audiophile use and has a fully regulated power supply with an external transformer. There are no tone controls. This unit has been tested and is in good working order. If you are looking for a fine example of a purist preamp at a reasonable price, this is the piece for you