[Elecraft] Lack of receive signal

[Jack Colson]

I just noticed that my K3 (s/n 1169) is not hearing signals on 7MHz. actually are attenuated to the point where they are almost non-existant.  I checked the att and pre amp setting and both seem to have an effect on the background noise but still no received signal !  I do not have a know weak signal source (shame on me).  I will start checking other bands as well but 40 is shot.
73 and thank you,
Jack, W3TMZ