- Aug 31, 2002
Are any of you familiar with sylvania 6sn7 gtb tubes? These have the black plates, top round getter and green lettering. I got some for my singlepower mpx3. I havent seen anyone comment on these. I scanned through most of Hirsch's singlepower tube rolling thread and I didnt see them mentioned. Anyone out there use them or have any links to their performance or characteristics? I know they are not a premium 6sn7 but I figured they would likely be better than a new stock tube like the EH 6sn7. I am heading over to AA to do a search now but any information is appreciated.