6SN7WGT JAN BLACK BASE
Finest audio double triodes manufactured in the United States by Sylvania or Philips for the US military. These robust 8 pin octal based glass tubes come with black plates and top getters. They are printed on base 6SN7WGTA with manufacturers name and 1970's or 1980's production code. Thay are also glass etched 6SN7WGTA U.S.A. Boxes are standard NATO coded military white.