[n9vu]

What Chuck said, plus no loop antenna in the 39-40 - it required a longwire. The 40-195 has a built-in loop.

Similarities: Both have about the same size chassis, both use thumbwheel controls, one chassis would fit in the cabinet of the other although the end result would be a Franken-radio (not that it hasn't been done before, even by me - I have a 660X cabinet with a 116B chassis inside, and my 66-S came with a 60 chassis).

I think perhaps this is what you were looking for (i.e. would the chassis of one fit the cabinet of another)? Remember, if you put a 40-195 chassis in a 39-40 cabinet, you would have to make provisions for the two loop antennas (the oval AM loop and the flat SW loop that mounts under the cabinet top). Not original, but does save an empty cabinet and orphan chassis from being discarded...it would work until you found the proper chassis to go into the proper cabinet, anyway.

OK. There was someone locally offering the 39 chassis. I have a 40 cabinet with chassis, but the dial glass is broken. The chassis I saw is working, glass in tact but this doesn't appear to be the viable alternative for repair. Onto the dial glass dude then.