Summary
2D21 tetrode, gas-filled, made by R. C. A. in the United States
It is thyratron, which is used as a switching device used for controlling relays and motors
It has a 6.3 volt indirectly heated cathode.
Physical Description
Seven-pin miniature tube.
More Information
-
Collection Names
-
Collecting Areas
-
Acquisition Information
Unknown Acquisition Method from Unknown Source, 17 Feb 1972
-
Manufacturer
Radio Corporation of America (RCA), United States of America, 1940-1950
-
Inscriptions
On bulb: 2D2 JRC-2D21
-
Brand Names
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
54 mm (Length), 20 mm (Outside Diameter)
-
Keywords