RCA 921 Photocell Tube  
Written by AnubisTTP on 2006-12-17  

 

Description

The 921 is a cartridge style side-viewing phototube with an argon fill gas. The tube has an unusual form factor, with two metal caps fritted to the ends of a glass tube. Each cap acts as one pin for the device, with one cap being equipped with a snap connector. As with the 1P41, this tube is intended primarily for relay applications.

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RCA 921 Photocell Tube
RCA 921 photocell tube.

RCA 921 Argon Tube
The RCA 921 is filled with low pressure argon gas.

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