Two-element Cold Cathode Tube 88
Tube à cathode froide à deux éléments
Zweielement-Kaltkathodenröhre

Neon glow indicator.
From B.T.L. (Bell Telephone Laboratory, Murray Hill, New Jersey).
Presumably experimental.

When a DC voltage supply is used, the negative polarity is to be applied to the upper electrode. When operating on AC, the glow appears on both electrodes.

 

Hauteur • Height • Höhe : 35 mm • 1" 3/8
Diamètre • Diameter • Durchmesser : 13 mm • 1/2"

 

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