Re: HMV 1920 made in 1960.
Hi Steve,
The 23SP4 tube was made in the USA by Sylvania and was fitted many TV sets including Pye group models and Thorn brands such as Ferguson and HMV. The adoption of this tube in late 1960 gave those manufactures a marketing edge over their competitors which were still fitting the rather round looking 17" and 21" 110 degree tubes.
Kolster-Brandes might have been the first UK manufacturer to employ the new 23" tube in the RV70 "Consort". The Brimar tube was the type C23AG.
DFWB.
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