up for auction is a pair of sylvania 6sn7gt 3 hole tubes. matching code dates of 226. hard to find a matching set these days and they are a pretty close matched set testing wise as well. both were tested on a jackson 648 tester and they tested fantastic, no leaks, or shorts and tight bases. the photos are very accurate. i let them both warm up for 10 minutes before testing. very nice testing set of vintage tubes here. good luck and good bidding.