Summary
Output triode, manufacturer: Mullard Radio Valve Co. Ltd. England.
4 volt directly heated cathode. Maximum anode voltage 225 Volts
Physical Description
Conical bulb with 4 pin European style base. No gettering and bulb is loose.
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 1925
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Inscriptions
Paper label on base: DFA9 PAPER LABEL AROUND BASE WITH WARNING ABOUT CHANGING GRID BIAS WITH HIGH TENSION CONNECTED.
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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
133 mm (Length), 53 mm (Outside Diameter)
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Keywords