Yes, your spades will work. Here is a pic of the back of an original Adcom 545:
http://www.canuckaudiomart.com/view_images.php?cat=Amplifiers&catnick=amplifiers&cfid=211109&image_id=2053224
http://www.canuckaudiomart.com/view_images.php?cat=Amplifiers&catnick=amplifiers&cfid=211109&image_id=2053224