Integrated with switchable voltage

Check Arcam.

Nuforce Integrated accepts voltage from 100-240 (Automatic). The new Creek flagship, the Dynasty, has a voltage switch, but I don't think any other Creek amps do. I also believe the Linn Majiks have voltage switches on the bottom. I don't know of any tube or hybrids that have a switch though.

Just now is advertised an Aronov 930 tube interated for around 600. That is an integrated tube amplifier, which easy to convert back and forth. I could email you the datails how to do, if you interested.

Thanks for the suggestion so far. Nuforce definitely sounds like an interesting idea. Aronov is out of business, but can still be a good contender since tube equipments generally don't go bad. There are not too much info on Aronov, will have to do some research on that.

I wonder if Nuforce has enough power to drive medium sensitivity speakers that's typical for bookshelf speakers. Tube is still my preference...

I have heard both in my system. Nuforce has a more extended, more detailed but somehow colder (some call it neutral) soundprint with a leaner midrange. Aronov is just wonderful in midrange, and has the right treble, maybe the bass is a bit less differentiated. If you mostly hear classical music, as I do, there is no contest. Aronov is the better ticket, as far as my taste concerned. If you hear mostly rock, pop etc - maybe nuforce is the better solution, especially taking into account its size, energy comsumption, easy to travel with and no-fuss construction. Still, it is radiating out RF and, for example, deteriorates tuner reception audibly. I dont know what other implication it might have.