Summary
A low power triode for use in telephone repeater systems, equivalent to Western Electric 101D
It has a 1 amp directly heated cathode
This valve would have been manufactured for use by the Postmaster General's Department (PMG) for use in their carrier telephone systems.
Manufactured by: Standard Telephones and Cables, England (most probably).
Physical Description
Spherical bulb with exhaust tip on top with black bakelite four pin UV style base
More Information
-
Manufacturer (Probable)
Standard Telephone & Cables Ltd (STC Ltd), England, Great Britain, 1930-1940
-
Inscriptions
Base: STANDARD TELEPHONES AND CABLES LTD./PATENTED IN GREAT BRITAIN/17580-15.161619.180090./4101D Wrong Museum Registration Number (026664) written on base.
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
107 mm (Length), 59 mm (Outside Diameter)