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
Lovely quartet of rare Marconi ST shoulder shaped with cooling fins on chrome plate!
Some say these type of PX4 dissipate better heat for long lasting performance.
Excellent sounding valves with full cup getter.
All four Marconi paper logo PX4 have been tested with AVO 163 at:
PX4 {1}: 55mA 100% emission
PX4 {2}: 56mA 100% emission
PX4 {3}: 54mA 100% emission
PX4 {4}: 53mA 100% emission
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