Experimental Phototube, maker unknown
Tube photo-électrique expérimental, fabricant inconnu
Experimentelle Fotoröhre, Hersteller unbekannt

Origin: USA.

The end window has some semi-transparent coating; two radial pins connect to a heavily metallized deposited ring at the face.

The lateral tubulation port could have been used for the introduction of small evaporation sources to form the photosensitive layer.

The filament, partially coated, has a resistance of about 4 Ω.

The “long electrode” has electrical connections at each end and is made of a folded thin sheet spotwelded into a tube-like structure. It would appear to carry a payload of material which could be resistively heated.

 

Hauteur • Height • Höhe : 126 mm • 5"
Diamètre • Diameter • Durchmesser : 56 mm • 2" 1/4

 

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