RCA 991 Neon Lamp (Glow Regulator Tube)  
Written by AnubisTTP on 2006-11-25  

 

Description

The RCA 991 is primarily used as a voltage regulator, but has also been known to be used as a indicator in some situations. Packaged in the same envelope as many T-4-1/2 bulbs, the 991 has a three connector bayonet base and is filled with neon gas. In operation, the bulb's two electrodes will both illuminate simultaneously when used with an AC power source.

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RCA 991 Neon Glow Regulator Tube
RCA 991 voltage regulator tube, normal operation.

RCA 991 Neon Bulb
The RCA 991 can also be used as a neon indicator lamp.

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