P-Series Valves, what to do with them?

[ppppenguin]

Not all sets had a thermistor, many just assumed the valves were tough enough for it not to matter. For the most part it probably didn't matter. EB91 double diodes in TVs often lit up like a small lamp at switch on. They were noted for having a long life. Post apocalypse the cockroaches will be using EB91s along with EF80s.