6SN7 tubes "made in USA" branded Sentinel. ????

Since this is a preamp tube, I posted here. My question is who might have made these tubes? RCA?, GE?, ???

audiojudge06-11-2002 3:28am

sugarbrie Details Discussions Posts This discussion Message User 3,854 posts 06-11-2002 at 04:26am Copy Comment URL Report Comment Edit Delete Sentinel was a brand of tube radio. They may have had special branded tubes made by someone else. Or maybe they made their own ??