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.
Holy Grail of audio valves!
This time we sell a magic quartet of Osram NR44 made for the Army and Navy.
The NR44 PX4 bear codes on glass ZOSJ with Z made at Hammewrsmith
Rare version of a NR44 PX4 with clean top, chrome ribbed plate and full getter. something to die for!
The NR44 PX4 ST Shoulder shaped with chrome plate is among the best valve ever made by the Marconi Osram works.
Here we have a QUARTET with chrome plate.
Excellent sounding valves with full cup getter.
NR44 PX4 chrome plate have been tested with AVO 163 at:
PX4 NR44 {1}: 55mA 100% emission
PX4 NR44 {2}: 54mA 100% emission
PX4 NR44 {3}: 56mA 100% emission
PX4 NR44 {4}: 54mA 100% emission
Supplied with provisional boxes.
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