[dirkbuddy]

Ok just tossing things around here, as seen in this pic, there is a mounting screw that attaches the square frame around the field coil to the chassis, the frame and chassis are separated by a rubber grommet, the grommet of course has been long dried up, inside the chassis there should also be a rubber grommet separating the screw head from the metal chassis, this grommet was missing, and someone had used a lock washer and plain flat washer, this resulted in making the screw "longer" which is why it was driven into the field coil, (approx 1/8 " deep) I did not remove the speaker completely but if you look at the pic you can clearly see the threads in the field coil frame which the screw went up through. I did not notice this on initial survey, but when I brought the radio up with a variac I could see the amp draw rise to almost 1A at 60 volts I then shut it down. I suspect numerous windings are damaged. In order to repair or rewind the coil, the cone and voice coil would have to be removed, the center core pressed out with an arbor press, the coil removed and repaired or rewound, and the speaker reassembled and likely reconed. Getting the core reinstalled and centered properly without the jigs likely originally used would be a challenge! and beyond my abilities I am afraid.
Therefore I am also considering replacing the FC speaker with a PM magnet speaker, this leads me to the following questions:
1) Could I use a 1140 ohm or close 10W resistor in place of the field coil?
2) would my current output transformer work?
3) Since my original FC speaker voice coil was 1 ohm, what impedance value of PM speaker would I need? 2ohm, 4 Ohm etc?

The schematic is also attached here as reference.

Any help would be greatly appreciated!