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U52 Mullard AMERTY on glass U52 top jagged mica, black plate with large D-ring getter Holy Grail rare pair 5U4G CV575 tested 100%

Mullard Amerty type U52 £ 700 pair

U52 Mullard CV575 ribbed plate square getter holy grail brown base double top mica tested 100% matched pair

Mullard CV575 U52 rare ribbed plate square getter £ 700 pair

U52 Mullard HELIX top mica RED PRINT ultra rare rugged plate large D-getter Holy Grail 5U4G CV575 pair tested 100%

Mullard U52 5U4G Red Print HELIX mica rugged plate D-getter £ 1,000 pair

U52 Mullard red paint AMERTY ‘long cone shape’ rugged plate, large D-getter jagged top mica Holy Grail 5U4G CV575 pair 100%

Mullard AMERTY U52 red paint rugged plate D-ring getter £ 900 pair

U52 Osram 5U4G brown base Square getter Blue cobalt logo km4 code Z tested 100% pair

Osram U52 5U4G blue logo £ 575 pair

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