Step-up/down transformers degrade performance?

If your transformer is of good quality there is no degrade of performance. If possible try to install the transformer within the unit's housing - that spares you any special powercords.
Good luck!

I find, that the situation is not as simple as Aida suggests. Some transformers work, some do not. If you have a very transparent system, transormers can colour the overall voicing of a system and influence dynamics in a negative way.
It also depends where you want to use the transformer.They often restrict dynamics when used on the poweramp side. For high powered amps, EquiTechs (www.equitech.com) can be a solution, which has the added advantage of balancing your powerline, but it is quite expensive. For frontend equipment, a PS Audio 300 or 600 could be considered (www.psaudio.com), which will input 240VAC and output clean 120 VAC power. Both these products have proven to be reliable and not detrimental in my system, which generally shows up every little change or tweak in the setup. Contrary obviously to Aida's experience, transformers have been a mixed bag for me.

I came from America, and now live in London. I have all 110V equipment,HDTV-DVD- Stereo-AVR , they all work .

High power amps should be converted.

I am using line conditioner/transformers for other high end components. E-mail me and I may be able to help you.
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Thanx all for your responses. I'm keen on buying hi-end Classe equipt (esp Classe CDP1) from USA/Canada from Audiogon but haven't found a London hifi dealer who will do the conversion - it's apparently quite difficult.
Will look into the suggestions made & will report back in due course.

hi
speak to customerservice at classe
they told me that their gear is 220vac compatible.
they are very helpful