Got a fair few amps...Laney R4, R410 & R115 stack, which is my main bass amp, Laney HCM65B which is my backup/uni amp, Roland Cube 60 guitar amp, and some dodgy german 12" monitor which I got for free. Bought it off ebay, didn't work, complained to ebay, seller never got back to me so ebay refunded. Then opened it up with dad and it was just a piece of solder shorting out the power supply...removed that and it works fine!