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U18/20 Osram helix top mica black rugged plate full mesh getter Holy Grail audio valves

Osram U18/20 Helix top mica £ 550 pair.

Osram U18/20bHelix top mica £ 1,000 quartet.

U5 Marconi Osram pip top CV3743 FIRST ever made rectifier 1926 super rare

Marconi Osram U5 Pip top year 1926 £ 500

U5 Osram balloon CV3743 FIRST ever made rectifiers pair 1929 super rare

Osram U5 matched £ 800 pair.

U50 directly heated rectifiers Mullard Marconi Osram 5Y3G CV1268 black plate square getter

U50 Marconi GEC Osram Brown base with square getter £ 180 quartet

U50 Osram 5Y3G black plate full cup getter early type Mullard Osram Marconi Philips BVA quartet

U50 black base full cup getter £ 160 quartet

U52 Brimar 5U4G STC Standard Telephones & cables smooth plate full cup getter tall glass pair tested 100% NOS

BRIMAR STC 5U4G U52 akin 274B £ 750 pair

U52 Brimar brown base Square getter black plate original boxes holy grail 5U4G pair tested 100% NOS

Brimar U52 black plate original boxes GBP 550 pair.

U52 BRIMAR early type with engrave logo on base! 5U4G ribbed plate large D getter holy grail rare

Rare BRIMAR U52 with engraved logo on base £ 800 pair

U52 Brimar STC Standard Telephones and Cables tall glass patented design ultra rare black plate large pinched cup getter 5U5G tested 100% pair

Brimar STC U52 tall glass cup getter £ 1,000 pair