Summary
PM4DX type triode. Triode designed for use as a sensitive detector in radio receivers but also suitable for use as a low frequency amplifier. 4.0 volt directly heated cathode at 100 ma, mutual conductance 2000, amplification factor 15. Manufactured by Mullard Wireless Service Co., England, circa 1927.
Equivalent to the Philips A415 except for filament current.
Physical Description
Base type: American UX style No. of pins in base: 4 Bulb shape: conical Bulb material: glass
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, 12 Sep 1978
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Manufacturer
Mullard Wireless Service Co., England, Great Britain, circa 1927
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Inscriptions
Bulb: Registered / Trade Mark / (Mullard logo) / RADIO VALVE / MULLARD / PM4DX / XA / PROTECTED BY PATENTS Paper label on base : (text) / P.M.4.D.X. / (red) THERE IS PRACTICALLY NO GLOW FROM THIS FILAMENT / (text)
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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
105 mm (Length), 45 mm (Outside Diameter)
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Keywords