6И1П-К (6I1P-K = ECH81 = 6AJ8) triode-heptode made by Reflektor 1972
<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>
2022-12-30 17:04:42
<span class="int-own-work" lang="en">Own work</span>