Replaced my ICOM 756 with the Flex-6500 feeding an MFJ 1775. The Flex won't tune 30, 17, 12, and surprisingly, 10. On those bands, the ATU engages and then cycles (clicks on and off) at about 60 - 90 hz and I have to manually abort the operation. Flex SWR shows in excess of 3:1. The antenna on 10 shows less than 3:1. The MFJ 1775 advertises it will tune the above with a tuner. The Icom tuned all of them and has a much narrower tolerance.