[Guest]

in this model (42-322) the rotor is grounded as you say but in the RF section the stationary plates are also grounded through the antenna coil. I was able to do a great alignment of the bcst section by just removing the loop antenna. Of course someone had to tell me to modulate the sig gen which changes an almost impossible job to a much easier one plus connecting the sig gen to the correct point. In the SW section the alignment was a real bear. I had a terrible time adjusting the osc trimmer and finally found the right signal (not a harmonic) with the trimmer almost bottomed out (max C). This is a great little AA-5 plus 1 except for the hum problem caused by almost everything in the house that is plugged in. There is nothing I can do about that because all the caps have been replaced with new ones. Messing with the wire routing under the chassis might help but I have spent enough time with this project.
Thanks to all for the help.
Dick