[old_tv_nut]

Zenith never had a quad tape machine, but did have a type C. I remember a Conrac color monitor with color bars fairly well burned in after many years. It's very likely the one you have.

Edit: I see you meant the small B&W monitor has bars burned in - yeah, that too. It was probably used with Zenith's slide/film chain that was in standby most of the time.