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Audio Output Triodes

PP5/400 Mazda pair audio tubes valves thick top mica with bottom getter PX25 DO24 equivalent

Mazda PP5/400 thick top mica bottom getters £ 1400 pair

PP5/400 shape Mazda V503 PA40 3B/355B CV563 CV1178 CV3768 DA30 pair directly heated mains output triodes

Mazda V503 £ 1500 pair

PX25 by 362 Radio Valve Co. Ltd. UK made in London pair audio valves with mesh plate stunning sound PP5/400 equivalent

PX25 by 362 Radio Ltd. £ 900 pair

PX25 DET5 Marconi GEC ultra rare pair valves old service code NT40 power amplifying valves CV384

Rare GEC DET5 £ 1500 pair

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