Admiral 20x122 - need help finding speaker

[dano]

I recently got one of these off of Craigslist. I haven't done anything w/ the electronics yet but I know the first problem I'm going to have is the missing speaker. I have a few that might work in with my radio parts, but I don't have a schematic and have no idea what impedance the field coil should be.... I have never used a TV with an electrodynamic speaker, I'm guessing the extra circuitry that the TV has compaired to a radio would require a bigger or lower DC resistance coil? If anybody had a schematic or actual set handy that they could check, it would be a big help.