Hi guys, I just bought the Orange micro crush CR6 stereo amp. Anyone know where to get the AC/DC adapter for this amp. According to the manual, It need a 18V-0.8A negative polarity. Last week, I ask the Yamaha shop in Singapura they said that Challenger carry is adapter but when I check the highest one Challenger carry is 15V-0.8A. Can it be used?