Here are 2 new old stock, vintage RCA 5692 (6SN7) electron radio amplifier vacuum tubes in original intact boxes. They have the brick red base and black plates. They are considered the premium version of the 6SN7 which is much more reliable and lasts a lot longer. They have matching base codes of 2-04 and tested on my TV-7 at 94/90 and 94/92, so very strong new testing tubes. They were also tested for shorts. I do have a few of these and can make a special listing if you are interested in more. The only difference would be the test results.
