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

ed_sawyer Details Discussions Posts This discussion Message User 588 posts 06-11-2002 at 04:03am Copy Comment URL Report Comment Edit Delete Post a pic and I can tell you. (was this one you got from me?) Thanks, -Ed