How to determine if an unmarked device is 110V or 220V?
You might try using an isolated variac transformer with 220vac input, start with an output of 110vac, (set the output before connecting the device).  Once connected slowly increase the output and see if the device climbs toward the expected operating conditions. (Be careful to watch for problems if the other components might be 110v rated as you hinted at.)  Don't go too far if the output is not heading toward the expected value, much better to err on the safe side.