NOS is subject to interpretation and there is no specific definition for it either. There are suggestions and opinions. Tube testers do not test for these problems in the manner in which you think, except to the extent that a tube tester with sensitive leakage detection will find far more “noisy” tubes than a tube tester with only “fair” leakage sensitivity, to the extent that the noise is due to this problem.
Item Tag: 12BY7A
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One Unknown Brand Vintage Tested 12BY7A Vacuum Tube
For sale is One Unknown Brand Vintage Tested 12BY7A Vacuum Tube. This is for ONE TUBE only. I will pick the highest remaining tested tube to ship. The Tube has been tested Good on my Jackson 648S between 87 and 112 with line 70 and top 130. No Shorts or Leaks detected. I do combine shipping. USA sales only. No international sales.