6Ж2Б-В (6Zh2B-V) subminiature pentode, made by MELZ. The tube exists in two variants, one with a flat pinch base, another with a round button base. Here the two are side by side.
<a href="//commons.wikimedia.org/w/index.php?title=User:Retired_electrician&amp;action=edit&amp;redlink=1" class="new" title="User:Retired electrician (page does not exist)">Retired electrician</a>
2023-01-02 14:21:41
<span class="int-own-work" lang="en">Own work</span>