[fenbach]

I think that one of the control connections [volume and tuning] in the model N is female, both male in FT-6.  
you can also compare schematics.  one for the model N is in the may-june ford service bulletin, pg 192, the FT-6 on line at http://www.nostalgiaair.org/pagesbymodel...014014.pdf
 at the least, you can compare the FT-6 pictures on line to your radio. in particular, check the location of the output transformer, part no. 46. in the FT-6, it's bolted to a vertical plate right in the middle of the radio. in the model N, it's bolted to a horizontal plate beside the vibrator on the tube side of the radio.
 good luck.