[Elecraft] KX3 questions

[Allen Bush]

Greetings:  I just subscribed although I've been an Elecraft customer for a long time (K1, K2 with all accessories, etc). I built a KX3 over the Christmas holidays and am just now getting a chance to use it.  2 questions..... Is it normal to have noise that is "tuneable"  especially across 40 meters?  (that is is is frequency specific.... with the antenna DISCONNECTED)?  It raises the s-meter one or 2 units when tuning.. This is NOT noise from the local area.    Also, my unit seems to be "microphonic" in that if I lightly tap the case a LOT of crackling comes from the speaker.  This seems to get much worse if I don't have the case screws tight.  I am a very experienced builder and Motorola bench tech so am not new to RF.  Any help would be appreciated.  THANKS!  Allen, W0OUU