This article has restoration notes for the 9L37 chassis that may be helpful:
http://antiqueradio.org/philc12.htm
As others mentioned, it's pointless to expect much in the way of performance until you have replaced all of the paper (or plastic-coated paper) capacitors. The article also shows how I replaced a couplate, if you find that necessary.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html