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I thought almost all valve tvs used series heaters. Mine doesn't but it's an unusual design, Ekco tmb272.



** Here in Australia nearly all valve TVs used large mains transformers. The valves used were 6.3v heater types plus 5V HT and 1.4V EHT rectifiers.

One reason would be that TV valves were made locally in the same factories that supplied radio and audio valves which also used transformers - so there was no local manufacture of series heater types.

The few sets that had series strings were imported from the UK or the USA and so were the needed valves. Same goes for the few compactron sets that were sold here.


..... Phil