Excellent pair of 1950's Raytheon 6SN7GT tubes. These are identical in build and sound to the Raytheon vt231, military spec tube. They have the famous Raytheon bottom square getter and the vt231 unique design of adding 2 extra support rods which run the length of the tube through both micas, in total, these tubes have 10 support rods holding 2 massive black plates; added to that are the 'y' clips at the top of the tubes for extra pin support; making them extremely microphonic resistant. Literally built like the proverbial tank. It is reasons like this that Raytheon tubes are so highly regarded. They tested very good and have no heat haze on the tops, indicating little use. The GT provides great 3d imaging and if your system is at all etchy, or you are mired in new production tubes, these are a no brainer. All conditions firm, meaning they will only sell for the list price and will not sell 'shipping included', paypal add 3.5%. Regular untracked shipping to US $10.....4 day tracked, $20, thanks.