[R-390] CV-591

[Jim Brannigan]

Thanks for the comments on the CV-591 and the R-390A.

The CV-591 was swapped for an SBA-1 and most of the SSB peak distortion went
away.

So I dug into the AGC and IF AMP. circuits on the CV-591, replaced a few
components and now it is "playing" much better.  There is a 10mfd. oil
filled CAP in the audio circuit that might also need replacing.

This is the first time that I used the Eldico SBA-1 with the R-390A and it
is interesting.  The SBA-1 has crystal controlled oscillators and a crystal
filter, so the R-390A must be run wide open (8 or 16MC. filter).  It also
has an IF gain control, notch filter, noise clipper and a BIG S-meter that
is fun to watch.

The filter in the SBA-1 is better than the '591 filter, so running wide open
is not a problem.
I'm not sure which one I prefer.

Jim