It's quite a hard question to answer. a contender might be the Bosch KCH1000 camera introduced in 1986. The middle/late 1980s was a crossover time for tubes v CCD and at that point tubes offered a better resolution than CCD could do, hence the tubed "HD" KCH1000 camera.
See
http://www.tvcameramuseum.org/bosch/.../kch1000p1.htm