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4XP Cossor audio output triodes PX4 PP3/250 equivalent long cone semi-coated full getter quartet

Matched Cossor 4XP £ 1,000 quartet.

4XP Cossor PX4 BVA type Z8216 made in England pair audio triodes tested 100% AC044 PP3/250 equivalent

4XP Cossor white print on glass £ 600 pair

50 Radiotron UX250 National Union CX350 Cunningham CX350 DeForest Audion 50 matched quartet balloon audio valves

Type 50 balloon mono plate £ 1200 quartet

50 UX250 CX250 Tungsol Philco mono plate large shape pair audio tubes

Tungsol Philco £ 300 pair

50 UX250 CX350 mono plate pair audio valves National Union Triad tested 100%

UX250 National Union and Triad £ 300 pair

52KU Cossor BVA black plate round getter white print on glass GZ32 5V4G equivalent pair rectifiers tested 100%

Cossor 52KU white print on glass £ 350 pair

52KU Cossor green label black plate BVA GZ32 5V4G 5Z4G equivalent also CV593 pair rectifiers tested 100%

Cossor 52KU Green label boxed £ 400 pair

53KU Cossor CV378 KB/K GZ37 ST fat shape pair audio rectifiers clean top large getter tested 100%

Cossor 53KU brown base £ 400 pair

53KU Cossor GZ37 Square getter British made yellow print CV378 GZ33 U54 pair tested 100%

Cossor 53KU GZ37 yellow print rare £ 250 pair