[Eric]

Question on the tubes on this radio?
looking at the #57 tube
Trying to trace wiring and want to number the print with the proper pin numbers on the tubes figured out the cathode(5), heater(1,6) and the plate(2) (which is the rectangle on the right of each tube?) but the other three got me is the screen grid always in the middle? I see on some tube prints they are labled G1,2,3. Any help would be appreciated.

Eric

Screen Grid ?
Supp Grid ?
Bias ?

http://www.nostalgiaair.org/PagesByModel...003276.pdf