NUX B-5RC Unboxing and First Impression

I just got a NUX B-5RC 2.4GHz wireless unit for guitars and basses. The build and finish is super but oh man there is some high pitched hum interference on an active MiSi pezioelectric and the Pignose. UPDATE: Later I went upstairs and used the unit and uke with a Vox Cambridge 30 Twin Reverb and the hum is mostly inaudible. I didn&hear it on the solid state channel until I moved the volume to 10 and it was barely there. On the tube channel it wasn&there at all from what I could tell. I&do a follow up later after more tests.