I've been using TITANs (3CX800A7's versions) on 12 & 17 for years, without thinking about plate-choke limitations/problems. I tune 12M from the 10M bandswitch position, and 17M from the 15M position, after testing the other possibilities. Any one out there looked at plate-choke limitations? I have not queried TT. 73 Dave W8FGX