This was lying on the surface on one of my local WWII airfields yesterday:
RAF radio valve VR22 10E/7958 (battery triode) as fitted in the following receiver sets from 1936 onwards:
R1082 (HF Aircraft Rx, paired with T1083)
R1084 (HF Ground Station Rx)
R1093 (Rx for Tranceiver TR1091)
R1120 (Rx for Tranceiver TR9D)
R1139 (Rx for Tranceivers TR9F & TR9H)
All the best,
PB
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