Dean,

... but it's missing
the dynamotor. I need to locate one because once I have the
set restored and working, it's going aboard our Museum's B-17
Flying Fortress (which means it has to run on 28 VDC). Any
leads will be appreciated.

have a look at the following URL, they advertise DM21s at a reasonable
price:

http://www.armyradio.com/arsc/customer/home.php?cat=86

Regards,
Thierry Stora

http://www.chapelon.net