Rick, this looks like a board to create an AM Stereo receiver on various modern/xstr stereo sets. The tube version is a non-starter. Tube radios of the day are not capable of AM Stereo as they have one discrete channel unless you want stereo mixed to mono on one AM frequency. A few Japanese plastic sets from the 70's did FM Stereo but not C-QUAM.
The Meduci site shows various receiver/boom box conversions that look awkward. You already have the RS receiver as do I. That is all you need for a receiver...just send it to an amp and the speakers. You need a xmtr.
And here are a few OTA stations still doing AM Stereo if you live in the area;
http://meduci.com/st_stations.html
What are you using for an AM Stereo C-QUAM xmtr? I have a kit I bought years ago at Kutztown. Here it is at the bottom of the page but I am not sure if he is still selling it;
http://www.amstereo.org/ccuff.htm
And I just bought a 1995 Cadillac with an AM Stereo radio installed. I may have to try mine to listen in the driveway. Good luck.