Integrated Amplifier

I'm from India. I am looking for an used Integrated Amplifier from Audiogon. But I have to face Voltage conversion problem when using it in our place. But I have narrowed down my list.
1. Mcintosh MA 6600
2. Mcintosh MA 6900
Kindly let me know whether it is easy to convert the Voltage from 110V to 230V. Your guidance will be a lot lot helpful to me. Thanks