April 24, 2024
NATIONAL UNION TYPE 50 Engraved Vintage RADIO Vacuum Tube Tested 85% #70
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Tested 85 on my Jackson testerI bought many old tubes from the widow of a long time radio collector. I will be selling these tubes over the next few months. I have a Jackson model 648 and a Sencore TC 130 tube tester. I just got a manual for testing the older tubes on the Jackson. I am learning as i go so bear with me. The needle on the Jackson goes from 0 to 130 % 70 is the line between good and bad. The Sencore goes from 0 to 120. 60 is questionable, 50 is bad and 70 and above is good. I will use this tester for most of the small tubes. Any untested tubes are sold as-is
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