Summary
Low mu triode intended for use as a power amplifier in telephone repeater applications. Manufacturer: Standard Telephones & Cables, England.
1.6 amp directly heated cathode designed to be used in a controlled current environment.
Superseded by 3B/151A in 1946
Physical Description
Spherical glass bulb with top exhaust tip and 4 pin UV style base
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Unknown Acquisition Method from Unknown Source
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Manufacturer
Standard Telephone & Cables Ltd (STC Ltd), England, Great Britain, 1936-1946
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Inscriptions
Bulb: AUSTRALIAN PATENT NO/1252-21/7-4-21 Base: 4205E
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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
109 mm (Length), 49 mm (Outside Diameter)
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