Military spec tubes (VT-229) made in the 1940’s. Very rare find. These tubes have long bottles with black bases, black plates and bottom-getters. One of the top-five 6SL7s. Sounds similar to later production Sylvania with its large soundstage. Price is Per Pair
Collection at AMK my Blk in evening during weekday and daytime in weekend.
Extra fee will be require for registered mail.