The Matsushita EF86 / 6267 tube is a premium EF86 and well suited for amps such as Dr. Z, Matchless, and Vox to name a few. These tubes were produced and labeled for General Electric (GE) but were made in Japan by Matsushita. Constructions details show it was made with the same tooling as many of the best Philips/Amperex EF86 tubes (silver mesh plate for example).
Commonly known as "NOS," the term New Old Stock simply refers to tubes that were made years ago but have never been used. Much like antiques, "NOS" tubes are currently not being manufactured and this means their supply is dwindling while the price continues to rise.
For most NOS tubes we have a variety of brands available. Typically these are the common brands such as RCA, Sylvania, GE, Raytheon, etc. However, there are instances where lesser known brands are in stock. If you have a particular brand you prefer you can simply request it in the Order Comment box when you place your order.