The 6J6WA is a special quality version of the 6J6 double triode. The 6J6WA was developed for industrial and military applications.
The construction has a common flattened tube cathode, with the control grids either side. The anodes are U channel sections either side of the central cathode.
The common coated cathode is in the centre with the grids above and below. At top and bottom of the image are the anodes.
The central portion of the electrodes.
The thin glass tube envelope is 18 mm diameter and 44 mm high excluding the B7G base pins.
Reference: Data-sheet. Type 6J6WA was first introduced in 1963. See also1963 adverts.