This is a piece of retro audio equipment. Due to its age, it is being sold as junk. I have tested its operation, though I am not a professional. Part of the circuit board on the back appears to be burnt. The black box-like component seems to be the cause. High-quality stereo integrated DC amplifier, MM/MC compatible, with tape dubbing function. - Model: Technics SU-V9 - Type: Stereo Integrated DC Amplifier - Input Selection: MM/MC compatible - Features: Tape dubbing function - Speaker Connection: Main/Remote connection possible Thank you for viewing.