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ID = 24979
Tube type:  Non-linear components 
Identical to WL706
Successor Tubes KX641  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial

Neon-filled voltage regulator, intended as stabilizer for locomotive headlights in Pennsylvania Railways. Has starter cathode for firing at 125 V.

100 V stabilized voltage at 600 mA max.

Originally developed as SX-606.

Text in other languages (may differ)
Information source Ballast Tube Handbook, The   

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