[rghines1]

Hi Clarence,

This radio uses a floating B- instead of using the chassis for a common negative return. Therefore the 20uf caps' negative leads do not connect to the chassis. On the 35Z3, pins 3, 4, 5, 6 are no connection based on the tube manual. They are likely being used as convenient tie points for resistors, etc..

Since pin 3 is no connection it could be used for anything.

Best to follow the schematic to insure all is electrically connected properly. Gets easier with practice.

http://www.nostalgiaair.org/Resources/396/M0013396.htm