6SN7 suffixes

I'm using 6SN7's in my Atma-sphere equipment. I was curios about the multitude of letter suffixes that follow the 6SN7 tube type.

fatparrot02-11-2005 7:42pm

fatparrot OP Details Discussions Posts This discussion Message User 1,314 posts 02-12-2005 at 01:01am Copy Comment URL Report Comment Edit Delete Gunbei, I was more interested in the designation of GT, GTA, GTB, W, and VT-231, and what they actually mean. I am pretty happy with the voicing of the Sylvania VT-231's in my system. What have been your experiences rolling the various 6SN7's? Why does everyone seem to rave about the Sylvania metal bases or the Sylvania "chrome domes"?
fatparrot OP Details Discussions Posts This discussion Message User 1,314 posts 02-13-2005 at 05:21am Copy Comment URL Report Comment Edit Delete Thanks all! Charliee, I use Andy at Vintage Tube Services, as I feel that he is the "go to guy" for all things tubes. I usually speak to him over the phone, so I hadn't been to his website since I switched to a high speed cable modem. Loading with my previous molasses slow modem speed and ancient computer, it could take awhile to download. Yeah, there's some good stuff there. Here's a link, so others can see why those want tubes go to Andy: http://www.vintagetubeservices.com/