[MrFixr55]

Hi Rob, 

Divide and conquer.  Think of the radio as an old school HiFi with a standalone Tuner (RF / Convertor / IF / Detector and standalone AMP (1st AF / Output / Power Supply).  Inject a good Audio signal (MP3, CD, etc.) into the Phone or TV Input and evaluate the sound.  The Audio section is no Fisher 800, but it is as good as any console radio that employs a 6F6.  If sound is good and pleasant, then troubleshoot the "Tuner" section.  However, if distorted, check wiring, etc.  Check the electrolytics C13,14, 15.  These do not share a common negative. Radios from the early to mid 30s sometimes have interesting ways of obtaining bias voltages and filtering them.  Hook up the negative terminal of the 'lytic and you will get hum.  Check the resistor Stack R13, 14, 15 and dropping resistor R16.  I always wondered if the capacity of the 'lytics was so low (4 - 15uF because of the expense of making bigger ones or if they really engineered some wild and crazy Pi Filter.  One can't go to crazy on the filter caps but maybe a little bigger?  Don't discount a rubbing voice coil either.  

Hope this helps!