The 49T tuner will work only if you do some rewiring of the Molex. As the 49-T doesn't have the heaters set up for cathode bias like the 440-T does, you'll be doing some serious rewiring. Plus it has the MPX-125 2 tube unit which is considered to be a lesser unit than the MPX-65 (3 tube). The 440-T doesn't have Multiplex built in so that might be a no go on that. The 460-T (62)has optional MPX-70 which I believe is the Zenith/GE MPX. But again it's optional. The (63) 490-T/490A combo has multiplex, and is the 1st year with it as built in on all units. MPX-65.