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

Marconi PX4 Shoulder shaped £ 700 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 ST shoulder shaped and chrome plate!

Excellent sounding valves with full cup getter.

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

PX4 {1}: 54mA 100% emission

PX4 {2}: 54mA 100% emission

Supplied with provisional boxes.

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