Strombergs are pretty easy to work on - some even have an upper frame to hold up the chassis when flipped over. The 350 was mid-line, 10 tubes plus tuning eye, should pull in stations as well as the best consumer receivers.
The Stromberg 350 service folder is on my webpage:
http://www.audiophool.cjb.net/MadeInRoch.html
(edit) Just noticed it was the 'R' model... the half-round cabinets are VERY collectible (at least _I_ want one!)