PC board marked McIntosh with relays. Sorry we know nothing else about what it is from or its history. As found at a hamfest flea market. Has 6 Takamisawa VBF 24HU 24v coil 30amp relays We tested it with 24vdc and continuity tester Has 3 pin terminal pin 1 common pin 2 is for 3 of the relay coils pin 3 the other 3 relay coils Contacts on top common and NO Relays all worked and completed circuit when energized 13oz 4.5x4.5 inches Corona update: We are working hard to ship most items out within one business day (ignore longer estimated time). Due to having only one person in the building, items are being shipped directly from sold page notification, not messages which may take longer to respond to. Therefore we are not able to respond to cancellation requests. PLEASE DO NOT ORDER AND THEN ASK TO CANCEL! Your order ships when paid. Also there are no returns (other than if an item is damaged in shipping) Thank You.