| 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.
The RCA 921 is filled with low pressure argon gas.
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