C9 is located in the bottom center of the schematic. One side of C9 (the negative side) is connected to chassis ground: http://www.nostalgiaair.org/PagesByModel/898/M0022898.pdf
:I have a Warwick Model 0-50 old radio. One of the capacitor's is missing. It is C9. The schematic is so small that I can't tell what value the cap is, and also can't tell where C9 goes on the schematic. Very small print. If anyone can help, I would appreciate it. Thank you, Tim.