[Boatanchors] S-38C BFO Question

[Curt]

Trying to resurrect an S-38C inherited from my father.  Recapped and hears 
AM well.  CW/SSB received well only by coupling signal generator 455 kHz 
signal to IF amp input.  All attempts to improve operation by manipulating 
the gimmick caps on 12AG7 IF input and output have  failed.  Would 
appreciate advice from anyone who has encountered and corrected similar 
issues.  The gain when in "CW" is very low.

73, Curt KB5JO