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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

PX4 Marconi red and green paper logo shoulder shaped with chrome plate, finned quartet valves 100% AC044 PP/250

PX4 Marconi with cooling fins on chrome plate £ 1400 quartet

PX4 Marconi ribbed plate red and green logo with full getter tested 100% pair AC044 PP3/250 valves

Classic Marconi PX4 valves £ 550 pair

PX4 Marconi ST Shoulder shaped chrome plate audio valves red and green logo AC044 PP3/250 equivalent

Marconi PX4 Shoulder shaped £ 700 pair

PX4 MarconiPhone early type 1940s black base black ribbed plate full getter same code 6 OG tested 100% AC044 PP3/250 equivalent

Marconi PX4 black base, black plate £ 600 pair