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Audio Output Triodes

PX25 VR40 Military Grade balloon early type CV1040 DO24 NR47 matched quartet tested 100%

VR40 PX25 Osram Balloon £ 2800 quartet

PX25A Marconi Holy Grail balloon V shaped base large anode DA30 300B alike extremely rare pair tested 100%

PX25A Marconi balloon £ 1500 pair

PX4 GEC early logo brown base black ribbed plate full getter tested 100% AC044 PP3/250 equivalent

GEC PX4 black plate brown base Cup getter £ 650 pair

PX4 Marconi balloon made in 1930s HOLY GRAIL! slanted 45 degrees plate AC044 PP3/250 equivalent

1930s Magic Marconi balloon PX4 purple logo £ 2500 quartet

PX4 Marconi black carbon ribbed plate LB 10 LA 10 on glass clean top large getter AC044 PP3/250 equivalent

Marconi PX4 brown base black plate £ 600 pair

PX4 Marconi fins on ribbed chrome plate Holy Grail pair audio valves tested 100% AC044 PP3/250 equivalent

PX4 Marconi ribbed plate cooling fins £ 600 pair.

PX4 Marconi large red logo with ribbed chrome plate clean top ST Fat shape tested 100% pair AC044 PP33/250

Marconi ST FAT shape PX4 red logo £ 700 pair

PX4 Marconi old red logo chrome plate balloon shaped clean top tested 100% AC044 PP3/250 equivalent

Marconi PX4 red logo balloon £ 900 pair

PX4 Marconi red and green decal early logo brown base black ribbed plate full getter code LH 10 and LE 10 on glass AC044 PP3/250 pair tested 100%

Marconi PX4 Black ribbed plate £ 650 pair