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Old 10-05-2008, 12:47 AM
Bob E.'s Avatar
Bob E. Bob E. is offline
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Join Date: Mar 2006
Location: Santa Clara, CA
Posts: 51
Yeah, there's some oldies in there...the ones with the evacuation seal at the top of the bulb are generally older than the ones that conceal it in the base. Brass pins and bases are a sign of early vintage, and the old "balloon" shape came in between the top-seal era and the shouldered-envelope age. I don't know how much "use" anyone will get out of any of them, I think they will appeal mainly to collectors. Your best resource, if you are interested in the subject or wish to identify them would be the book "Tube Lore" by Ludwell Sibley. I consult my copy all the time!

--Bob
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