The lower input terminal is grounded. The upper input terminal goes through a .01 mike cap to the grid of section 1 of a 12 A X 7. This grid goes to ground through a 10 meg ohm res. The cathode goes to ground through a 100 ohm res. A terminal connected to the cathode is labeled feedback. The plate goes through a 270 k ohm res to plus 300 v. The plate of section 1 goes to the grid of section 2 through a .01 mike cap. The cathode of section 2 goes through a 10 k ohm res to point A. Point A goes through a 100 k ohm res to ground. Point A goes through a 470 k ohm res to the grid of section 2. Point A goes through a .1 mike cap to the lower output terminal. The plate goes through a 100 k ohm res to plus 300 v. The plate also goes through a .1 mike cap to the upper output terminal. Each output terminal goes through its own 470 k ohm res to ground. The output terminals are labeled to output grids. End verbal description.
go back.