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Electronic Valve - Marconi Osram, Tetrode, Type MS4B., 1933 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
|Dimensions:||120 mm (Length), 33 mm (Diameter)|
|Tagged with:||thermionic electron valves|
|Themes this item is part of:||Engineering Collection, Information & Communication Collection|
|Secondary Classification:||Vacuum Technology|
|Inscriptions:||Stamped into perforated cover: Patented/Made in England
Transfer on cover: Osram/(catkin)
On cover: MS4B
|Manufacturer:||M. O. Valve Company, England, 1933|
|References:||Fin Stewart: History of GEC and the Marconi Osram Valve. PP 50-53, 79|