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Mostly because it wasn't used in Chain Home or Chain Home low, which were HF and VHF rather than centimetric.
Plus it was invented in 1940.
None of the kit shown seemed capable of producing the sort of power levels (300kW?) that were mentioned.
You need big valves (really big valves) for that power level.
And it cooks you if you're not careful with it.
One of my physics lecturers (I forget his name) used to tell us stories of working on the early radar stuff. Apparently on a cold morning, they'd go out and warm their hands in front of the things.
Hands looked a bit knarled but worked okay still.
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