MARSH MSD-HT500S 3-CHANNEL POWER AMPLIFIER - 100 WPC - CLEANED - FULLY TESTED. WITH BOX AND OWNERS' MANUAL. THIS 3 CHANNEL AMPLIFIER WORKS GREAT AND IS IN EXCELLENT CONDITION INSIDE AND OUT. (WE HAVE BEEN IN BUSINESS FOR OVER 60 YEARS REPAIRING VINTAGE AUDIO EQUIPMENT.) IF YOU HAVE ANY CONCERNS, PLEASE CONTACT US PRIOR TO YOUR PURCHASE.