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Audio Output Triodes

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

PX4 Osram blue logo matched quartet audio valves tubes AC044 PP3/250

Osram PX4 matched quartet £ 1,000

PX4 Osram chrome plate with fins paper oval logo AC044 PP3/250 pair audio output triodes

Osram PX4 chrome plate with fins £ 600 pair

PX4 Osram early 1930s slanted plate balloon shaped tested 100% AC044 PP3/250 equivalent

Osram balloon 1930s valves type pX4 £ 1,200 pair

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

PX4 balloon Osram chrome, ribbed plate £ 900 pair

PX4 Osram old gold logo clean plate G code on glass PP3/250 AC0/44 equivalent quartet tested 100%

PX4 Osram Gold £ 1200 quartet