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

rodman99999 Details Discussions Posts This discussion Message User 3,557 posts 05-13-2017 at 01:03pm Copy Comment URL Report Comment Edit Delete The only Amperex 6SN7GTBs that I’ve seen, had bottom getters(on one side/from Europe). Apparently, there are other iterations out there though, per these pics. No info though(sorry): https://www.google.com/search?q=amperex+6sn7gtb&tbm=isch&tbo=u&source=univ&sa=X&...: