Amperex 6SN7GTB

I have 2 of these USA made Amperex tubes, one with a top getter and one with a side getter…does this indicate different manufacturing eras?

wolf_garcia05-12-2017 9:18pm

ghosthouse Details Discussions Posts This discussion Message User 4,319 posts 05-13-2017 at 08:17pm Copy Comment URL Report Comment Edit Delete Try emailing Tubemonger and/or Brent Jesse with pics. They might have some insight.