Summary
Two electronic valves: unknown manufacturer and RCA.
Twin triode were intended for use as a push-pull class B power amplifier. With a 135 volt supply this valve could produce an output of about 2 watts. It was designed to be operated with zero bias which eliminated the need for a low impedance bias supply and the distortion caused by the commencement of grid current. 2.0 volt directly heated cathode.
Physical Description
Shouldered glass bulb with American style 6 pin base mounted on display block with a sectioned example of a similar valve (ST 022189.2). Internal structure of a twin triode with bulb removed. American style 6 pin base mounted on display block with an intact example of a similar valve (ST 022189.1).
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mr S. A. Pick, 10 May 1945
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Manufacturer
Unknown Source, 1933-1940
Intact valve -
Manufacturer
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Inscriptions
On bulb: 19 (faint) Display block: Description and brief data. On base: RCA (logo)/CUNNINGHAM/MADE IN U.S.A./RADIOTRON/(Licence clause)/Z 3 Display block: Description and brief data.
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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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Part Dimensions
102 mm (Length), 35 mm (Outside Diameter)
Overall Dimensions of intact valve, excluding display block.
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Part Dimensions
95 mm (Length), 28 mm (Outside Diameter)
Overall Dimensions of sectioned valve, excluding display block.
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Keywords