I have a working Stromberg-Carlson 1121 and a 1235 that I am currently working on. If you want to identify S-C sets and get free schematics and service information, check here:
http://www.audiophool.cjb.net/MadeInRoch.html
and scroll down to the end of the page. One thing about Stromberg-Carlson - they never tried to skimp on weight.