RCA 991 Neon Lamp (Glow Regulator Tube) | |
Written by AnubisTTP on 2006-11-25 |
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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](media2/pict34/rca991tube.jpg)
RCA 991 voltage regulator tube, normal operation.
![RCA 991 Neon Bulb](media2/pict34/rca991tube2.jpg)
The RCA 991 can also be used as a neon indicator lamp.
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