Preamplifier The LUXMAN 5C50 is a stereo DC preamplifier from the Laboratory Reference Series. It incorporates a thorough approach to sound creation, such as using newly developed FETs in the first stage input to eliminate noise as much as possible. I really liked the pure, clear sound without any impurities, a LUXMAN tradition. I have been using it with care, but I am selling it due to a model change. I have used it very carefully. There are minor scratches. Please check the photos. I have confirmed the operation of all input terminals. I have cleaned the circuit board and input terminals, and cleaned the interior and exterior. There is no noise from the switches and VRs. I do not smoke, so there is no nicotine staining. I think it is quite clean overall. The last two photos show the unit in use.