UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Nuvistor · 23rd Jul 2016, 5:09 pm

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

23rd Jul 2016, 5:09 pm	#113
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,431	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