[R-390] R-390-A fix summary

[Jim Temple]

Recently, the bottom 350khz of ALL bands were found to be dead.  Tuning to a
point below 350khz produced an abrupt loss of signal.  I confirmed that the
symptoms were present above and below 8mhz, and within all the band groups
defined from the coil and RF deck positions.  The likely suspect seemed to
be the PTO, so I put the frequency counter on the output and confirmed that
the frequency abruptly disappeated below about 350khz.

I replaced the PTO tube, the symptoms disappeared, and the unit now works
perfectly.  Of course I will recheck the alignment after the tube burns in
for awhile.

For the newbies on the list, I hope this might be helpful in the future.

Jim