>From the photos, it looked like the glass was stained brown. Is this the case
>or just the camera/lighting? If so, then it is probably a tube that (like
>4PR1000) ran very high voltage, and the darkening is from continuous Xray
>bombardment. It would have run under oil in that condition, most likely. Is
>there any scent of oil or residue under the base?
Jim Tonne, are you sure about Tom Yingst? He was at RCA/Lancaster for years
during the development of many tubes, but I thought his tenure at Eimac was
shorter and that the Y designations preceeded him there. There were plenty of Y
numbers for their developmental and special tubes that were for sole use by a
particular customer also.
73
John
K5PRO
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