Description
These JAN 12K8 tubes tested strong with no shorts on a Precision 10-12 tube tester. The 12K8 was originally designed as a frequency converter with oscillator section, and was use extensively on WW2 radios ( SCR-274, AN/ ARC-5, RAX-1, etc). And after the war it was used in several commercial and civilian radios. If you need one, this is a good deal at this price. Because, it comes with a spare and they are not making any new ones!