A couple of observations which may help.
1: RCA lists the load resistance of a 41 as 12000 ohms. Rogers lists a 6K6GT as a substitute and its load resistance is also 12000 ohms.
2: The parts list says that T5 is the speaker. This would lead one to believe that this is not a permanent magnet speaker but the 3000 ohm choke is the speaker field coil.
Hope this helps. TTFN
John G. VO1 CAT