Help! The power cord for my son's band's vibraphone has gone missing. The motor is a Yamaha YVM-100 25-150 rpt drive unit. All it specifies on the motor is 12 volt, but no amperage.

Can anyone tell me how many amps this needs? I'm sure I can buy one at Radio Shack, but I don't want to burn out the motor when I get one with too many amps.

Sorry that should say 25-150 RPMS (not rpt ... been at work doing reports too long today!)