changing from 220v to 120v

+builder3, call Bryston.  While your at it, make sure with Bryston that there are no warranty issues if you do it yourself.

jumpers needs to be resolderedhttps://ibb.co/RC4NntF

James Tanner, owner of Bryston, recommended not buying amps built for a different country. I am going to heed his advice.  I'm also worried the warranty might not transfer.

thanks for all the responses. 

I woulds never buy a 220v amp to be converted get 110v only it could be a problem.

it really depends on how a specific unit is built and whether it is internally configured with proper power transformers and circuitry to handle different input voltages - some are easy to do, made for quick-shift... others not so much

so i would lean on the manufacturer to advise on the wisdom of the input voltage swap