Summary
The 57 was a sharp cut-off pentode designed for use as an audio and RF amplifier, also used as a biased detector and autodyne converter.
It has a 2.5 volt indirectly heated cathode.
The most popular valve line-up for Australian superheterodyne receivers in 1933 was 57 converter, 58 IFamplifier, 57 biased (anode bend) detector, 47 output valve and 80 rectifier. This line-up remained in use by some manufacturers until 1935.
This valve must have been manufactured in or after 1936 because it carries AWV's excise mark.
Manufacturer: Amalgamated Wireless Valve Co., Sydney, NSW.
Physical Description
Shouldered bulb with top cap on six pin base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mr Richard H. Fowler M.Agr.Sc. - Institute of Applied Science of Victoria, 27 Oct 1971
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Manufacturer
Amalgamated Wireless Valve Co Pty Ltd (AWV), Sydney, New South Wales, Australia, 1936-1939
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Inscriptions
Bulb: 57 Base: Raditron/Made in Australia/(excise mark 1 on 4)
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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
126 mm (Length), 38 mm (Outside Diameter)
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References
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 1982
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