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



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.


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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