I went the other way, buying in the US and importing to the UK. Conrad Johnson are switchable by changing the input connections on the transformer, from series to parallel I think. Spectral are switchable, in fact I know of someone importing a Spectral Pre and buying an expensive voltage transformer, only to discover a simple switch to change voltage, when he lifted the hood!
Most manufacturers make for a world market, it is only sound business to make them saleable in all markets, by easily adjusting input voltage. The exception may be valve amps. I imported a Viva Solista from the US and adapted the voltage. However, capacitors kept blowing and evidently, it needs new transformers as well, which is being done at the moment. That may appy to other valve(sorry tube) amps. Incidentally, I rather annoyed the designer of the Viva amps by importing from the US. I hope he has removed the Fatwa against me. Most manufacturers and importers hate grey imports and you have to factor in the loss of support you may have from the distributors in your own country, if you do bring a unit into the country.
Most manufacturers make for a world market, it is only sound business to make them saleable in all markets, by easily adjusting input voltage. The exception may be valve amps. I imported a Viva Solista from the US and adapted the voltage. However, capacitors kept blowing and evidently, it needs new transformers as well, which is being done at the moment. That may appy to other valve(sorry tube) amps. Incidentally, I rather annoyed the designer of the Viva amps by importing from the US. I hope he has removed the Fatwa against me. Most manufacturers and importers hate grey imports and you have to factor in the loss of support you may have from the distributors in your own country, if you do bring a unit into the country.