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Electronic Valve - Hygrade, Diode-Triode-Pentode, Type 1D8GT, 1939-1945 Object Reg. No: ST 022199

Summary:
This valve combined detector, first audio stage and output valve in the one envelope. It was intended for use in portable radios. It was popular with manufacturers because it saved a valve and the space it occupied.
1.4 volt directly heated cathode. Used as class A audio amplifier and class A power output amplifier.
Description:
Tubular bulb with octal base and top cap.
Acquisition Information:
Donation from Arthur J. Veall Pty Ltd, 1943
Discipline: Technology
Dimensions: 80 mm (Length), 32 mm (Diameter)

More information

Tagged with: thermionic electron valves
Themes this item is part of: Engineering Collection, Information & Communication Collection
Primary Classification: ELECTRONICS
Secondary Classification: Vacuum Technology
Tertiary Classification: amplification
Inscriptions: Bulb: 1D8GT
Base: Hygrade/MADE IN USA
Manufacturer: Hygrade - Sylvania Corporation., United States of America, 1939-1945

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