Summary
Two small output triodes. The PM 4 was the first of the PM (Philips-Mullard) series to be released in 1925. 4 volt directly heated cathode.
Physical Description
Intact valve: conical glass bulb. American style 4 pin (UX) base with Bakelite shell mounted on display block with a sectioned valve of the same type ST 021572.2. Sectioned valve: conical glass bulb mostly removed to show horizontally mounted rectangular electrode structure mounted on a glass pinch. American style 4 pin (UX) base with Bakelite shell mounted on display block with an intact valve of the same type ST 021572.1.
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, 03 Mar 1941
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Manufacturer
Mullard (Australia) Pty Ltd, Sydney, New South Wales, Australia, 1925-1930
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Inscriptions
Intact valve: Bulb: (Mullard Radio Valve logo) / MULLARD/ PM 4 / A147 / SOLD FOR (illegible) / ONLY / MADE IN GREAT BRITAIN Display block: Description and brief data Sectioned valve: Bulb: PM/MULLARD/4/MADE IN GREAT BRITAIN Base: P.M.4/PM4(sticky label)
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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
108 mm (Length), 45 mm (Outside Diameter)
Overall Dimensions of intact valve, excluding display block.
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Part Dimensions
103 mm (Length), 45 mm (Outside Diameter)
Overall Dimensions of sectioned valve, excluding display block.
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Keywords