<https://forum.vcfed.org/index.php?threads/looking-for-any-old-vacuum-tubes.8658/>
<http://schema.org/articleBody>
"I was going through a closet today and found a B&K 707 Mutual Conductance tester that I don't even remember getting, but, do you think I could scrounge up a single vacuum tube to test it out with?\n\nIt's in great shape, has the operator's manual..."
<https://forum.vcfed.org/index.php?threads/looking-for-any-old-vacuum-tubes.8658/#post-150163>