Summary
General purpose triode used in battery powered radios in the late 1920s. It had an amplification factor (mu) of 15, somewhat higher than the 9 of the common types of its day. 4 V directly heated cathode, manufactured by Philips, Holland, and used as a class A amplifier.
Physical Description
Conical glass bulb with four pin UX 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, 1981
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Manufacturer
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Inscriptions
Bulb: MADE IN HOLLAND/PHILIPS/A415/MINIWATT Paper label on base: A415
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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
92 mm (Length), 41 mm (Outside Diameter)
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Keywords