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PX25 Marconi balloon audio classic triode pair CV1040 PP5/400 DO24 valves tested 100%

Marconi PX25 balloon £ 1200 pair

PX25 Marconi NT40 Audio Triode early PX25 type DET5 CV1223 equivalent pair power amplifier triodes tested 100%

NT40 DET5 A.P. 4687 £ 1500 pair

PX25 Osram {probably the first batch} enraged logo on glass large anode V shaped base P27/500 CV1040 PP5/400 equivalent

Early 1930s Osram PX25 V shaped base £ 1400 pair

PX25 Osram balloon audio triodes CV1040 DO24 P27/500 PP5/400 tall glass pair tested 100%

Osram PX25 balloon £ 1100 pair

PX25 style PTH25 Marconi Osram CV1046 white ceramic base high efficiency audio output pentodes of the highest quality matched quartet

PT25H VT46 balloon white base £ 1500 quartet

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