I recall the early Triton IV's needed an internal mod to work with the remote VFO. Ten-Tec should have that information. If not, I could probably dig it up for you. Carl, K4SEV. **************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom00030000000001)