Hi,
My secondary school had a huge Baird B/W TV, also on a tall stand with castors and doors, It was set up on the stage of the assembly hall to watch the launching of the QE2. I was about half way back, so could just about see!
It lived in our English classroom and was in the wrong corner away from the power socket. Our teacher sent me and a mate out to a local hardware shop for some cable, a plug and a surface mount socket, plus cable clips, and we installed an extension. Can you imagine that happening today!
Anyway, back on topic. It seems odd to have an isolating transformer as well as a dropper resistor. Most other 'public service' tellies had redesigned power supplies with the transformer providing heaters and HT.
Cheers, Pete.