Summary
Output pentode, used as a Class A power output amplifier and a Class AB1 amplifier.
Philips developed the pentode (they spelled it penthode) for audio output applications in 1927. The E443N was released in 1928; it was designed for AC operation and could produce an output of over 5 watts with a plate supply of 400 V. It was replaced soon after by the E443H which could produce an adequate output with a more convenient 250 V supply.
Manufacturer: Philips, Holland.
4 V directly heated cathode.
Physical Description
Conical bulb with 5 pin UY style base.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Telesonics Pty Ltd, 09 Nov 1971
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Manufacturer
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Inscriptions
Bulb: Philips Miniwatt/Penthode/E443N/Made in Holland Base: (Paper Label re test)/E443N (in pencil)
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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
119 mm (Length), 56 mm (Outside Diameter)
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References
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 55 Pages
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