Re: Earliest BBC2 Sets?
None used in the UK that I know of, the trend was to replace the cascade RF amp with a neutralised triode such as the PC97 (1961) and PC900 (1963).
I first saw these in Thorn TV's in the VHF tuners, others makers followed later. How well these worked compared to the frame grid PCC89/189 valves I don't know, we were in a good signal area.
I would not be surprised if the change was to reduce costs, but it would be nice to know if they were a technical improvement.
Frank
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