Summary
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.
Physical Description
Five pin European style base with top cap. External anode construction with protective ventilated housing (Catkin). Perforated metal cover to protect the external anode.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Exchange from H. Burtopt, 13 Jul 1973
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Manufacturer
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Inscriptions
Stamped into perforated cover: Patented/Made in England Transfer on cover: Osram/(catkin) On cover: MS4B
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Brand Names
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
120 mm (Length), 33 mm (Outside Diameter)
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Overall Dimensions
120 mm (Length), 34 mm (Outside Diameter)
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References
Fin Stewart: History of GEC and the Marconi Osram Valve. PP 50-53, 79
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