leiko,
smps uses another type of transformer, the chopper transformer, it is not the same as the convetional transformers that we know, it uses electronics, and is subject all by itself.....
many amps being exported from japan have a voltage selector at the back, they do this because it makes good business sense to them than making amps with fixed voltage tranformers, if a unit is to be exported to usa for example, then all they have to do is change the voltage tap, and to europe, they do the same thing, changing taps is more economical than changing transformers to fill up an order..also they do not need to stock up on each type and this means lower inventory, and a lower inventory means higher profits!!! are you still with me? many of the amps that we buy are made based on business decisions....