<p>Dissection of a Soviet-made type 6P1P miniature 9-pin beam tetrode vacuum tube circa 1980s
</p>
The anode, beam forming plates and the screen grid have been removed. The control grid and its support rods surround the cathode.
<a href="//commons.wikimedia.org/wiki/User:Mister_rf" title="User:Mister rf">Mister rf</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>