The 6N6G is a double triode. One triode is a voltage amplifier and the second, directly coupled to the first, is an output audio triode. The output triode needs to work to a 7,000 Ω load and can produce 4.0 Watts of output. The grid bias is internally generated.
The Brimar advert shows how to use a 6F6G to replace the difficult to obtain 6N6G.
The amplifier triode is on the right. The anode is stitched together with a flange that also holds the spot welded support rod and connection.
The power triode anode is much larger. There is a pair of grids joined together with a common heat sink. The inner winding has copper supports but not the outer.
The power section anode is formed as two triangles with central flanges stitched together and spot welded to the support rods.
The top mica showing the two sets of grid supports welded to the radiating fin.
The images are spoilt by the reflections from the glass.
The classic envelope is 44 mm in diameter, and excluding the IO base pins is 101 mm tall.
References: Data-sheet, & 1043. Type 6N6G was first introduced in 1937. See also1937 adverts.
