A very informative write up I really enjoyed reading that ! I saw a fair few 900s & 950s as a lad. They were being disposed of in their droves in the mid 70s. Probably because of the colour boon.
I never saw one of these personal sets though, I didn't know they made them until the internet. I have a couple of 950s in my collection and an 850 but all are 19" . The only smaller screen portable sets I have are a 1400, that funny folded around chassis. 980? and a couple of the 405 only sets with the controls on the top the chassis number escapes me at the moment.
I didn't know about the thermistor fault either it sounds as if it was fairly common. ISTR repairing a set with a "wiggery" frame collapse. I probably just swapped the coils. I had loads of parts from scrapped sets I rarely threw anything away. When I moved out of home the sheds were cleared and the whole lot went in the dustcart. I never thought I would want it again!
Rich.