6N24P vacuum tube, USSR (Voskhod Kaluga) 1973
<a href="//commons.wikimedia.org/w/index.php?title=User:Tvezymer&amp;action=edit&amp;redlink=1" class="new" title="User:Tvezymer (page does not exist)">Tvezymer</a>
2007-01-12
<span class="int-own-work" lang="en">Own work</span>