Summary
The B403 is a low mu triode intended for use in the final stage of radios.
It has a 4 volt directly heated cathode. Used as a Class A audio amplifier.
Manufactured by: Philips, Holland
Physical Description
Conical bulb on 4 pin European 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: B403/PHILIPS/Miniwatt/Sold for amateur use only/3.4-4.0V/20-120V/Made in Holland
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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
105 mm (Length), 45 mm (Outside Diameter)
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Keywords