[R-390] BFO question

[Kenneth]

I am going to get the BFO working on My R390A, once and for all. I have the
Y2K manual, of course, but I need a little advice. Here is what I have; the
BFO does not work, there is no calibration tone in the R390's audio but I
can hear it from the SBA-1 side band adapter, I can see a calibration
carrier in the signal strength meter on the R390.  The tubes on the IF/RF
module test good, if I can trust my tube tester that is.  Where do I start
on this to figure out what is going on. I have replaced the two questionable
caps in this module.  The radio works fine otherwise.  I have not been too
motivated to repair the BFO because of the side band adapter.

                             Ken