Summary
This valve is probably an output triode. Manufacturer: Mullard Radio Valve Co. Ltd. England.
No reference could be found to a PM4D; there is a PM4DX which is a general purpose triode. The PM4D may be a derivative of the PM4 and hence an output valve.
4 volt directly heated cathode. Dull emitter. Anode voltage 125
Physical Description
Conical bulb with 4 pin UX style base. Paper label on base is disintegrating,
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from I. E. Morton, 10 Mar 1972
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Manufacturer
The Mullard Radio Valve Co. Ltd, England, Great Britain, circa 1928
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Inscriptions
Bulb: Mullard logo/Mullard/PM4D Paper label on base: PM ...
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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
108 mm (Length), 45 mm (Outside Diameter)
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Keywords