AK Model 42 Transformer Ground?

[Winky Dink]

Thanks. I've covered this ground before, but I rechecked both issues. The antenna autotransformer shows 6.4 ohms and 18.8 ohms. I have a spare transformer that shows the same resistances within 1 ohm. The rheostat has been disassembled twice and totally rewired (but saving the shielded lead), carefully inspected and tested. I just tried bypassing the coil with the red lead (directly to grid) but it made no difference in any way. Putting the lid on the set reduces the volume by 80 percent.
The rheostat has no effect on the volume in this configuration.

I think I've tried every other configuration from rheostat to grid. I have a Model 37 that works well. It's nearly identical to the Model 42, but instead of the antenna transformer it simply has a choke from grid to ground. I was thinking of disconnecting the antenna transformer and using the choke from the older set just to see what happens. Your thoughts?