No problem. I was in the USAF for 20 years and know what can and can‘t be made public.
I think that if they are whining, they are most likely Autogated tubes. The last batch of MX-11769s I had sent to me via 1033, I have almost finished test all 20 of them. One was an ITT tube that was labeled as MX-11769/UV but it whined!? I did further tests on it and it was in good shape so it must be an Autogated aka MX-11769A/UV tube. A few days after finding that one, I found a Litton tube labeled as an 11769, but it to whined and was serviceable. For whatever reason, they were not labeled correctly. In about two weeks I‘ll be going thru some ITT and Litton MX-10130C & Ds. I‘ll be looking for any that whine and are not labeled as "E"s. Enjoy your weekend, Ed
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