MARANTZ SR-18U  / WA300J1012, WA300J1022 COMPLETE WORKING AMPLIFIER MODULE. THIS IS THE COMPLETE WORKING AMPLIFIER MODULE WITH PREAMPLIFIER BOARDS AND FAN ASSEMBLY. (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.