Amperex 7308


Did Amperex make the 7308 tube without the PQ Shield logo?
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YES- Some that were manufactured in the US, under military contract, were labeled, "USN", "USN-CEP" or had a "JAN" designation. Still the exact same tube. There are three colors of label(white, green, orange) and each has a slightly different presentation. Some Amperex 7308s had a globe logo also. Be certain of your source's honesty, as these are being counterfeited. They should all have a seam in the glass, across the top of the envelope.
Glory - Some pertinent information.

http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html