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Half wave and full wave rectifiers

U52 Osram 5U4G CV1071 black plate full cup getter pair audio rectifiers tested 100%

Osram U52 black plate 1940s tested 100% £ 600 pair

U52 Osram brown base BBC Valve Section same code on glass LC 4 black plate Square getter Holy Grail CV575 5U4G tested 100%

Osram U52 black plate BBC Section £ 575 pair

U52 Osram gold BBC green sticker codes FK 4b FB 4 1953 black plate cup getter 5U4G CV575 CV1071

Osram BBC U52 gold logo £ 600 pair

U52 Osram gold, tall glass vacuum valves black plate cup getter Holy Grail 5U4G CV575 pair tested 100%

Osram U52 black plate cup getter £ 600 pair

U52 Osram tall glass black plate blue logo rare 5U4G cup getter CV575 CV1071 pair 100%

Osram U52 Blue logo £ 600 pair

U52 Rare Marconi ZA 3034 Z Hammersmith arrow—–> black plate cup getter Holy Grail audio valves 5U4G CV575 pair tested 100%U52

Marconi U52 5U4G ZA 3034 on glass £ 600 pair

U52 Rare Mullard CV1071 5U4G black T-shaped plate full cup getter clean top pair rectifiers tested 100%

Mullard CV1071 U52 T-shaped plate tested 100% £ 700 pair

U52 Rare old GEC logo codes U52 FJ 4 U52 GJ 4 black plate cup getter CV575 CV1071 tested 100%

U52 GEC black plate codes on glass £ 600 pair

U52 Tungsram 5U4G black ribbed plate double top mica square getter narrow plate tested 100%

Tungsram U52 5U4G code 5U £ 400 pair