Yes, Dave You Do Remember Correctly (YDRC).
When I was in high school in the '70's, we had them in every room, mounted to the wall, hospital style. About 100 classrooms total. They were beige metal cabinet sets. The "unit-ized" chassis in those sets had exposed tubes on each module, not totally enclosed like the model 150 being discussed here. They might have gotten an average of 1-2 hours a day use. They contracted repairs with a local shop. I often wondered why our electronics students were not repairing the sets. We had the instruments, capability, and were fixing students' and teachers' sets.
Students were able to view video taped lectures from teachers with greater detail than normal lessons if you were stuck on a concept. Mostly science and math. The tapes were housed in an AV Room, and could be ordered by number over an in-room phone handset. They were piped into the classroom over closed circuit coax. The video could be delivered to one, a group, or all classrooms. Later, they did color video on demand using Asian built sets, with both local and remote live video, as well as VHS/DVD capability.
Yeah, we were a rich kid's school! Federal funding from the 1960's model schools program did not hurt either!
