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

Description

The PX4 is a super-power output valve for powerful receivers, capable of driving moving coil and large speakers at full volume.

Type PX4 is a directly heated power triode for the output stage of receivers and amplifiers where a considerable undistorted power output is required with an anode voltage up to 300. For this purpose the PX4 valve has exceptionally good characteristics  and is particularly suitable for operating moving coil speakers at large volume without distortion.

The filament of the PX4 is of the robust oxide coated type and may be heated from A.C. through a suitable step-down transformer

Filament Voltage 4

Filament Current 1.0 amp

Anode Voltage 300

Grid Voltage -42

Anode Current Average 50mA

AudioMagical tries to cover all PX4 type made from the beginning of 1929 up to the 1960s.

Pair of rare Marconi PX4 with brown base, ribbed black plate, one of the best PX4 around.

White decal on glass and both have close codes on glass LA 10 LB10

Excellent sounding valves with full cup getter.

Both Marconi white logo PX4 have been tested with AVO 163 at:

PX4 {1}: 63mA 100% emission

PX4 {2}: 65mA 100% emission

Supplied with provisional boxes.

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