The K731s all had solid wood cabinets as well, which is one reason these sets sound so good. I had my '731 playing this afternoon on the oldies station in Cleveland and was very impressed, as always, by its bass response. This is another reason we AKers should do our level best to keep these old radios out of the landfill--they were the height of quality in their day, and still are to collectors.
I will send a PM on another matter when I finish this.
Kind regards,