[R-390] 3 MHZ issue

[Steve Quinn]

My R390A is in good working order, all old caps were replaced, a new PTO, etc., 
etc., the rig is not a junker.  Lately when I tune to 3 MHZ it comes in for 
about 30 secs then it goes dead ............

I move the Mhz dial but that does not work ........... all other setting up and 
down the MHZ work just fine .... I am not a repair person but can get around in 
these old radios.

Any help, suggestions would be helpful ........... I am a bit of a newbie to 
radio having only gotten back into it after many years away ...........great 
memories of my Navy days in signal intercept, CW etc ....... ah the good old 
days

Picts would be helpful if one has an idea where the problem is located

Steve Q