Corby, I think the S/N format you're showing was adopted sometime in 1996.
If this is correct, then your USxxxxxx tube is a bit newer than the rest. See, http://www.hpmuseum.org/collect.htm#numbers Pete Rawson _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
