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Electronic Valve - Marconi Osram, Tetrode, Type MS4B., 1933 Object Reg. No: ST 028631

Sharp cut-off tetrode, used for amplification in radio receivers and audio amplifiers, manufactured by Marconi Osram Company (UK) in 1933.

Tube is known as catkin tube, used as Class A R. F. amplifier.

The name "Catkin" derives from the prefix "CAT" used on the Cooled Anode Transmitting Valves made by Osram, Catkin being a diminutive of it. They were expensive and troublesome in production and were only produced for about two years.

4 volt indirectly heated cathode.
Five pin European style base with top cap. External anode construction with protective ventilated housing (Catkin).
Perforated metal cover to protect the external anode.
Acquisition Information:
Exchange from H. Burtopt, 1973
Discipline: Technology
Dimensions: 120 mm (Length), 33 mm (Diameter)

More information

Tagged with: thermionic electron valves
Themes this item is part of: Engineering Collection, Information & Communication Collection
Primary Classification: ELECTRONICS
Secondary Classification: Vacuum Technology
Tertiary Classification: amplification
Inscriptions: Stamped into perforated cover: Patented/Made in England
Transfer on cover: Osram/(catkin)
On cover: MS4B
Manufacturer: M. O. Valve Company, England, Great Britain, 1933
References: Fin Stewart: History of GEC and the Marconi Osram Valve. PP 50-53, 79


A Sheslow Posted on 16 Dec 2011 11:00 AM
Just correcting the spelling of Harold's name:
Harold Burtoft.

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