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<blockquote data-quote="jeallen01" data-source="post: 1088515" data-attributes="member: 176704"><p>As I said, according to that list it's photocell - it was the UK "Common Valve" ("CV") equivalent of a commercial valve called the VS26, and apparently dates from the 1930's. More data and data sheets on both types here <a href="http://www.r-type.org/exhib/aaa0890.htm" target="_blank">CV161 @ The Valve Museum</a>.</p><p></p><p>In the very early days of photosensitive devices such a device would have to be large to collect enough photos for the first stage of further amplification. Not sure what it could have been used for in military applications, but maybe to detect when a beam of light - such as when a searchlight was briefly interrupted by something like an aircraft, and thus triggering some form of "alert", or maybe detecting when a high-power transmitting valve was glowing more brightly than it should and thus was overheating??</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1088515, member: 176704"] As I said, according to that list it's photocell - it was the UK "Common Valve" ("CV") equivalent of a commercial valve called the VS26, and apparently dates from the 1930's. More data and data sheets on both types here [URL='http://www.r-type.org/exhib/aaa0890.htm']CV161 @ The Valve Museum[/URL]. In the very early days of photosensitive devices such a device would have to be large to collect enough photos for the first stage of further amplification. Not sure what it could have been used for in military applications, but maybe to detect when a beam of light - such as when a searchlight was briefly interrupted by something like an aircraft, and thus triggering some form of "alert", or maybe detecting when a high-power transmitting valve was glowing more brightly than it should and thus was overheating?? [/QUOTE]
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