No need to replace that tube, cataract surgery is par for the course for collectors on these color sets. Not recommended for the novice, however!
I recall some TV's, especially motorized tuner sets where there was only one turret, made after the '64 era that required UHF, having additional spaces on the tuner that allowed inserting a UHF or VHF coil strip for whichever couple of UHF stations might be in your area.
Actually, our '76 RCA behaved like this, though you preset the UHF station for channel A, B, C, etc. from behind a trim panel on the front. You'd also set the motorized tuner to bypass the unused locations.