I downloaded the
McIntosh C2500 service manual
from elektrotanya.com:
https://elektrotanya.com/mcintosh_c2500_preliminary.pdf/download.html
On page 55 and 57 of the service manual show the jumpers (J1) for voltage selection, and I also found a photo of the C2500 inside view show 230/240v for J1:
https://farm4.staticflickr.com/3712/9102539524_1b1baedbea_b.jpg
Look like very easy to do the conversion.
https://elektrotanya.com/mcintosh_c2500_preliminary.pdf/download.html
On page 55 and 57 of the service manual show the jumpers (J1) for voltage selection, and I also found a photo of the C2500 inside view show 230/240v for J1:
https://farm4.staticflickr.com/3712/9102539524_1b1baedbea_b.jpg
Look like very easy to do the conversion.