Summary
PH55 dual diode. 2.5 volt indirectly heated cathode, Manufactured by Philips, circa 1934. The diodes in this valve were designed for use as the signal detector and automatic gain control rectifier in radio receivers, the low mu triode section was designed to be used as the audio amplifier following the detector. Its low plate resistance made it suitable for transformer coupling to a push-pull output stage. Equivalent to the type 85 except for the heater voltage.
No country of manufacture shown, it cannot have been Australia, Philips started manufacture in Australia in 1936, too late for this valve. It was probably made in England.
Physical Description
Base type: American type No. of pins in base: 6 Bulb shape: shouldered Bulb material: glass Top cap
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, 13 Sep 1978
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Manufacturer
Philips, England, Great Britain, circa 1934
Philips started manufacture in Australia in 1936, too late for this valve. It was probably made in England. -
Inscriptions
Bulb: PHILIPS / PH / 55 / MINIWATT
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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
110 mm (Length), 38 mm (Outside Diameter)
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Keywords