Thank you All for the points. Yes , it is a MB problem. Yesterday night I did tests like connecting and Disconnecting the cables, fully charged battery , bending the connectors(the wires from motors are really short) , open and check the radio and the noise persists.
Well, I have the same point of view of You, gentlemans= Board []. To solve this problem = replace the Mb for HL boards.
How I won't do this replacement right now, What I did: I found , after almost one hour of tentative, a neutral point in the radio. This point is very , very sensible and due this, if you force a super spin , the tank turn in the opposite way(trust me). After this “adjustment” the noise in the motors is almost imperceptible . I have a new KT in box and I chekc it for this problem.
I have a quetion: Replaced for HL eletronics, could I use the same original motors?
Thank you so much Mart, Alan, Blitz, Wacky and Thomas. We really learn a lot with the people in this forum. Jeferson