Summary
Power triode used in telephone repeater systems.
SY in the type number indicated that this valve was made in the Sydney factory of STC, the first 4 indicates that it is the STC version of the 104D.
Equivalent to the Western Electric 104D. 1 amp directly heated cathode.
Manufacturer: Standard Telephones and Cables, Alexandria, NSW.
Physical Description
Spherical bulb with exhaust tip on top with brown bakelite four pin UV style base
More Information
-
Collection Names
-
Collecting Areas
-
Acquisition Information
Donation from Australia: Post Master General's Department (PMG), 16 Jul 1970
-
Manufacturer
Standard Telephone & Cables Pty. Ltd., Alexandria, New South Wales, Australia, 1930-1959
-
Inscriptions
Base: S.T.C./SY4104D/Australia
-
Brand Names
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
104 mm (Length), 59 mm (Outside Diameter)
-
References
[Book] Tyne, Gerald F. 1987. Saga of the Vacuum Tube., 1987, 286 Pages
-
Keywords