Summary
A tetrode in a holder, manufactured by Marconi Osram in England, introduced in 1927.
Tetrode (or screen grid tube) is used in high frequency amplification. Feed back from anode to control grid was virtually eliminated by uising a screen grid between them.
A 6 volt dull emitter filament operating with a current of 0.25 amp. Cf. Diagram in Tyne "Saga of Vacuum Tube", page 385.
Physical Description
A double ended, double base tube with three pins at one end and two at the other.
More Information
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Collection Names
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Collecting Areas
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Acquisition Information
Donation from Mrs F. Jeffery, 07 Jun 1976
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Manufacturer
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Inscriptions
Bulb: MADE IN ENGLAND S625 PATENTED MARCONI VALVE
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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
125 mm (Length), 34 mm (Outside Diameter)
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References
Diagram in Tyne "Saga of Vacuum Tube", page 385.
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 385 Pages
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