Summary

High voltage triode. Used as a shunt regulator in high voltage supplies for cathode ray tubes and photomultipliers.
The number 6538 (on the bulb) may be a date code indicating the manufacturing date of week 38 of 1965.
Manufacturer: National Union Radio Corp., Orange, NJ, USA.
6.3 V indirectly heated cathode.

Physical Description

Tubular bulb with metal shell octal base with top cap.

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