[Arran]

Ed;
  Two other thoughts occurred to me the other day after I had posted last. On these sets the shortwave bands each have their own antenna coils located around the band switch, but the antenna coil for the AM broadcast band uses the loop antenna, so if the loop antenna is not connected, or incorrectly connected the broadcast band will not work. The puishbutton bank could also cause this problem, if it is connected incorrectly the radio will also not work, however if it is connected correctly this should be a good way of checking the oscillator as each coil and capacitor assembly on the P.B bank switches into place of the B.C oscillator coil near the bandswitch.
  The IF cans may or may not be worth investigating, they are slug tuned (permeable tuned) but the fixed caps are either molded micas, or NPO ceramic caps, not cheap silver mica sandwiches like a 1950s kitchen radio would use. 
Regards
Arran