1970 & Toaster
Just put my two cents in here.
The advertised TBC in the 1970 is really just a skew corrector ala
3/4" Sony decks. The meaning of a TBC is that it correct's the lenght
of the line of video not just the leading edge of video. A
synchronizer does this but is generally used just for sat feeds or
video camera's that are already time base correct. The WJMX-10 series
mixes video this way. While you can do this one the result is never
again RS-170 spec video.
I can't believe that Panasonic has a TBC button on the front of the
deck but at least they have quit adverstising it that way.