Hi chrisdrop, Guess what - I am listening to the Sylvania 6J5GT/G, EL32 and 4x6080! Basically I am so happy with the EL32/4x6080 that I mainly switch out the front driver (pair) only. Also have three other choices for the C3g slots, EL8 and EL11 and C3g of course, but I am happy to stay with the EL32s. One day I have to roll the other choices with a favorite driver and see if I can pick a winner.... Re the Sylvania 6J5GT/G on your picture, the SC 966 A is not a date code; it is a quality control code: Signal Corps Inspector 966 (same idea as the OTK on Russian tubes). Please look for two small letter/number symbols such as H 5 which is the date code. The letter is the month and the the digit is the year - 4 is 1944 etc. Just put in the Sylvania straight glass tubes yesterday. The first hour or two they did not sound good with weak bass. But after two hours they suddenly blossomed and now I have very nice bass. IMHO the Sylvanias have a very wide and expansive sound stage and beautiful everything. There are many rebranded ones available with the round plate and these tubes are real bargains for what you get. Thanks to LG to steering me to these tubes. Happy Listening! PS: Did you post the spring thing link? My stuff sits on a heavy metal equipment rack with spikes on the bottom that sit on a wooden floor. Each shelf sits on four little tabs with a thin piece of rubber and a small glass marble (to cancel out vibrations) between the tab and the shelf (based on a tip from Steve Guttenberg from many years ago).