all pres have an external amp. this is mostly displayed on the pre "Mosfet 50Wx4" while rms ratings are at max 22Wx4. And by Japanese tuner meaning all the channels are in that language or does it have the AM-FM-SW radio?
tell him to tell you the model number of the pre.
Does the FM go all the way till 109 or does stop at 98? Mini discs are not very common, so if ur planning on buying it, dont rashid bhai.