Item ST 32989 Thermal Delay Switch - STC, Type VLS 631, 1950-1957

Summary

Miniature thermal delay switch designed to provide about 60 seconds delay between the application of heater voltage and anode voltage in indirectly heated valves and mercury vapour rectifiers.

Manufacturer: STC Valve Division, England
This device was renamed S102/1K circa 1957.
6.3 volt heater, delay 50 to 60 seconds at 20°C.

Physical Description

Tubular glass bulb with exhaust tip on top with seven pin miniature configuration.