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 characteritics 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
Quartet of Gold logo Osram PX4 circa 1950.
In excellent condition with ribbed plate
They have been tested with AVO VCM 163 and got current of
PX4 Osram gold tested 55mA 100% emission
PX4 Osram gold tested 56mA 100% emission
PX4 Osram gold tested 57mA 100% emission
PX4 Osram gold tested 55mA 100% emission
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