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



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.


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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