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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

U54 Marconi full wave rectifiers 53KU GZ34 equivalent British made code rs1 mint New Old Stock pair tested 100%

Marconi U54 MINT NOS £ 300 pair

U8 Osram balloon directly heated rectifier nickel plate V shaped oxide filament Holy Grail

U8 Osram balloon very rare £ 450

UU120/500 Mazda pair balloon audio rectifiers Holy Grail of valves IW4 R2 R3

Mazda UU120/500 £ 900 pair.

UU3 Mazda BLACK PLATE balloon shape nickel plate IW4/350 R2 R3

Mazda UU3 £250 pair

Mazda UU3 £ 450 quartet