British CV1988 6SN7GT One of the best quality 6SN7GT tubes available! These amazing military spec tubes, various brandings, are known for their amazing soundstage, extended dynamic range, and attention to detail. Produced in the 1950’s these vintage British made tubes were actually tested and sealed for the military in 1964 until we opened them this year! If you are an audiofile, you owe it to yourself to pick up a pair of these NOS tubes at an amazing price! This is a suitable replacement for any 6SN7 tube type. Various brands available.