Summary
A double diode, branded Mullard, made the USA by an unknown manufacturer, introduced in the mid 1950s and used as a full wave rectifier mainly in television.
Manufacturers would share the production of valves. All of a particular type were distributed by different firms but would have come from one factoiry.
It had a 5.0 volt directly heated cathode.
Physical Description
Octal base. The base is made of mica filled phenoloic material, more heat resistant than plain black bakelite. This tube ran very hot.
More Information
-
Collection Names
-
Collecting Areas
-
Acquisition Information
Unknown Acquisition Method from Unknown Source, 17 Feb 1972
-
Distributor
Mullard (Australia) Pty Ltd, Australia, Circa 1956
Manufacturer unknown -
Inscriptions
Bulb: 5R4GY Base: MULLARD MADE IN USA
-
Classification
-
Category
-
Discipline
-
Type of item
-
Overall Dimensions
135 mm (Length), 50 mm (Outside Diameter)
-
References
[Book] Babani, Bernard B. 1958. International Radio Tube Encyclopaedia., Third, 250 Pages
-
Keywords