i am using hitec servos( the programmable one's about 35kg) and a power jack in a jl f15 with 2 cell lipo's and a power box switch that has a regulator in it and it is fine on this set up, the power jack is not a regulator in any way i know the instructions lead you to belive that it is but it is not, i know this for sure because the shop that supplied it (motors and rotors in the uk) spoke to the owner of the company that makes it about this very subject.