Western Electric 1-A phototube
Cellule photoélectrique
Fotozelle

Used in early projectors for reproducing the movie sound track. It uses potassium hydride as the photo-sensitive material.

 

Hauteur • Height • Höhe : 97 mm • 3" 13/16
Diamètre • Diameter • Durchmesser : 58 mm • 2" 1/4

This tube has lost its vacuum.

ERPI is an acronym for Electrical Research Products Inc, a division of AT&T, Western Electric/Bell Labs.
They were the major player in the early days of sound on film.

 

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