A MCINTOSH C38 PREAMP CONTROL SYSTEM, CAME FROM THE ORIGINAL ESTATE OWNER, TESTED THE LEFT AND RIGHT CHANNELS AND BOTH WORK, INPUTS AND OUTPUTS WORKS, THE FRONT FUNCTIONALITY WORKS BUT THERE ARE TWO ISSUES THAT I HAVE NOTICED, WITH THE REMOTE WHEN YOU UP THE VOLUME IT DOES NOT FUNCTION ONLY TO LOWER THE VOLUME BUT MANUALLY IT WORKS, THE MUTE FROM THE REMOTE DOES NOT WORK BUT MANUALLY IT WORKS SO I AM NOT SURE IF ITS THE REMOTE OR THE CONTROLS ITSELF, COSMETICALLY IN VERY GOOD SHAPE, VERY LITE WEAR NO DINGS OR DAMAGES,, WILL BE SOLD WORKING WITHOUT ANY TYPE OF WARRANTY DUE TO BEING USED. WILL BE PACKAGED IN A DOUBLE WALL BOX, WITH A 1-2 INCH THICK FOAM.