When did Sylvania stop making tubes?

I have some Sylvania tubes that say Made in USA. Anyone know when they stopped making them in the US?

spareribs01-04-2009 12:45am

slikric3000 Details Discussions Posts This discussion Message User 638 posts 01-04-2009 at 09:54pm Copy Comment URL Report Comment Edit Delete I just made a truck load delivery to Sylvania on 12-31 in York,Pa. I don't know but this may help you out.
thsalmon Details Discussions Posts This discussion Message User 348 posts 01-04-2009 at 09:45pm Copy Comment URL Report Comment Edit Delete In the early eighties when Sylvania merged with GTE. The Sylvania name was then sold to Philips to market electronics and Osram to market light bulbs. By about '83 or '84 there were no US or Western European tube manufacturers of significance.
benie Details Discussions Posts This discussion Message User 147 posts 01-04-2009 at 08:32am Copy Comment URL Report Comment Edit Delete I believe they were bought out by Philips. Not sure how long they used the Sylvania for afterwards.