Summary
4.0 V directly heated cathode. Used as class A power output amplifier. The pentode was superior to a triode as an output valve; it could deliver much more power to the load for the same plate supply and required considerably less drive. 4.0 volt directly heated cathode.
Physical Description
Glass bulb sectioned with American style 5 pin (UY) base mounted on display block.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Purchase
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Manufacturer
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Inscriptions
On bulb: FIL VOLTS 4/BVA/PROTECTED BY PATENTS/Mullard (top half) On display block: Brief description of the valve.
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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
100 mm (Length), 50 mm (Outside Diameter)
Dimensions not including display blck
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Keywords