Step down transformers detrimental to SQ?


Hello, does anyone know if step down (or up) transformers have adverse effects on sound quality? I'm looking to pickup a 100V amp and use a step down here in US. 

Thanks
mrkoven
@erik_squires Thanks for the tip that is an amazing price...

Thanks all this has been informative.
You can get a bucking transformer for less than $50.00 that would do the job with many amplifiers. You might have to spend $100 for a really big amp.
+1 on the Accupower.

I bought one and am pleased with it.  In the event you purchase one, I suggest you opt for one which allows for future growth.

Regards,
Jose