Wollensak school TV-Setchell Carlson?

[Olorin67]

I Just picked up a Wollensak branded Vacuum tube TV, that looks identical to the Setchell Carlson school Tvs. 23", with audio and video inputs using CB radio style connectors. Did Wollensak (div of 3M) buy out Setchell Carlson?

Gets a nice bright raster when i brought it up on a variac, but not sure its getting a video signal, just a blank screen. next I will take the back off and clean up the tube pins. will be an easy re cap with the modular construction.
I will take some pics when i get home.