End of Double-Ended Sereen-Grid Valve.
(PHE Marconi and Osram type of sereen-grid valve is to undergo a change. In future they will be made on the same plan as the UX222, with the ordinary four pins in the base and the fifth or control grid connection on top of the bulb. A eopper "lid" is to be supplied that will completely screen the valve externally. standardisation and facility in manufac ture are the reasons bringing about the decision to make the change.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19281019.2.68
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Radio Record, Volume II, Issue 14, 19 October 1928, Page 27
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82End of Double-Ended Sereen-Grid Valve. Radio Record, Volume II, Issue 14, 19 October 1928, Page 27
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