The old Zenith with zoom, oh yeah. However those didn't really vary the HV, at least not on purpose. The modified the H pulse to the yoke and cranked the V height.

When you get to the HD TV sets, you will find some with separate HV because alot of them didn't actualy upconvert. You had 1080i and 480p, a 480i signal really just went through a line doubler. RCAs dealt with the differences in sweep using the flyback, in fact in the DTV3XX series they varied the B+ voltage to compensate. That's why there aren't too many of them around anymore, it was not a good idea. The ITC and ATC chassis were quite a bit more reliable.

The HD Sonys have a separate flyback driven from a totem pole of two MOSFETs. The frequency is does not give a **** Hz, but it is higher than the sweep, which seems like a good idea.

Separate HV was really popular in CRT based RPTVs. In those, it solved alot of problems all at once.

I can't think of any Panasonic direct views with separate HV, and now that I mention it, neither in their RPTVs. There could be a model or two out there I have not seen though.