I remember in the mid 60's till about 1967 that in my public grade school in Manhattan that once in a while they'd wheel in a monster of a TV that sat up very high in the air on this wheeled contrivance.....like those giant roll around ladders you see in large warehouses (reminds me a little of those rolling gangway stairs the airlines used on old time aircraft)

It was made out of a light colored Masonite or particle board and may have been painted with zolo-tone (AKA Splatter paint, like what's used in car trunks). There was a speaker grille on a side, and I think the controls were there too. It was an ugly mutha, although a feeble attempt at style was made by the front (in profile) slanted. Of course it was B&W. Seems they hooked it up to a cable feed, and it may have been a Board of Ed or early PBS source.

Does this ring any bells?

Anthony