[R-390] R390A going deaf

[John L. Ahrens Sr.]

 Hello Group:
 I have  a strange problem with my R390A just started Wednesday nite i
notice that the signal where getting weaker and weaker i was on 3.880
MHz than i changed over the to another rec. and found the the signal
weren't getting weaker the R390 A was going deaf so i check some diff.
bands and found that the 3mhz band is deaf low signals.
     so not having any test gear i used the cal. for a test signal all
other band seem to be OK with 50db signal on meter but the 3mhz band
only show 10db signal so with all of the R390A  master out here could
someone suggest a possible cause...

               Thank You for any help

            John kc2fxe