I use a 9 volt 500ma adaptor on my 106, and have no trouble. However, the manual calls for an adaptor that can make 1000ma. The batteries will charge in the scanner. You must use the YELLOW battery holder to accomplish this. The manual also recomends a "C" adaptaplug, but they are loose fitting, and not reliable. The manager at the local Shack here recomended a "B" adaptaplug, and it fits and performs better than the "C."
...for what it's worth..............