Just thought I would send in a few pictures of that Heathkit O-Scope I have... It still works but can't really be used for anything but trying to see what "shape" a given input is... Picked it up at a yard sale for $20 about 15 years ago... Come in handy once or twice! Oh ya, I havent opened it but from what I can see inside, and from the amount of heat that it gives off, it contains vacuum tubes
Heathkit products were sold in the U.K. in association with Daystrom of Gloucester.
There were modifications to suit British 240V supplies, and U.K.-specific TV models for our 405/625-line services. Some Heath/Zenith products were not sold here at all (e.g. all CB-related stuff, as there was no legal CB service in Britain before 1981).