If they test questionable then it really does not matter. That is not an acceptable "new" tube.
Tube Question--Signs a tube is brand new
I just received a box of 25 6550 tubes off ebay which were listed a Never used Sovteks from the early 90s. The seller has 10 boxs of 25. He stated that they were NOS and never installed in a unit. I just tested 3/5 of them and they all test in the middle range of "questionable" on my tube tester. I have some older GEs which test "good" so I know my tester is accurate.
Is there something within the tube which indicates if it has been in operation for a period of time? I compared some of my used 6550s and the top and bottom round plates look grayish and identical to the ones which were just sent to me and supposedly new.
Is there something within the tube which indicates if it has been in operation for a period of time? I compared some of my used 6550s and the top and bottom round plates look grayish and identical to the ones which were just sent to me and supposedly new.
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