I am on the first operation of assembling my K2. I have the controller board just about done and have a question on the IC's. On page 19, for U1, it says to use a NE602 or SA602. I only have this IC and was wondering if they replaced it: NE612AN FXH0725 9622ma All the other IC's have the correct number to the instruction manual. Thanks for any info, Mike Grose, K4YL serial # 4042