| Raytheon A704 Photocell | |
| Written by AnubisTTP on 2006-12-22 |
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With an envelope size of just over an inch, the A704 is one of the smallest phototubes ever made. This tiny two pin tube does not even have any discrete internal components, the photocathode is just a chemical, most likely a lead sulfide photoconductor, painted onto the back wall of the envelope. The tube has an argon fill gas, but its specifications are otherwise unknown.
Raytheon A704, a tiny two pin photocell.
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