[retiredinprescott]

The 70 and 90 speakers also have the pressed-in pole piece, as Mark has already pointed out; while the 20 speakers have a nut that holds the pole piece in place. The speakers with the nut holding the pole piece are the ones that have solid spiders. At least, that has held true for every type K speaker I have seen. The K-2 and above have open spiders and pressed-in pole pieces.

Ron,
Do you know anyone who can rewind the field coil in a model 70 speaker by somehow removing the pressed in pole piece, rewinding the coil and then resetting the pressed-in pole piece? I believe Hank Brazeal could rewind the field coil but I don't think he can deal with the pressed in pole piece. It's certainly beyond my abilities to remove it. That's why I'm currently looking at a PM speaker and a large power resistor to replace it...

Thanks,
Mark