I was rifling through my old NBTV photos (as you do) and I came across this scan of a photo showing my first project in the NBTVA. These units, I think, date from the early '90s and have now been long cannibalised (or recycled if you prefer). Oh... and they never really worked, but I'm sure we can overlook that small point! .
This was supposed to be 45-line colour! 20'ish-inch Nipkow discs were used. I seem to recall Doug Pitt had to help me obtain Darvic of a big enough size. At the monitor, the modulated light sources were small white fluorescent tubes with gelatin filters sitting on the anodes of three EL34s.
The motors were ex-Lada heater fan, obtained from a breakers, later to be used again with the 'Grosvenor' and its camera. Incidentally I've slapped a preservation order on the Grosvenor kit, so it should be spared the fate of this predecessor; mind you it helps that the Grosvenor actually worked... My memory fails me but I think the camera used three 'eye response' photodides from RS, with filters.
(Not so) happy days!
Steve O