I keep it like this and asked APRIL music whether it will cause any harm. S100 power amp is very hor when it runs due to its discrete push-pull circuitry. Christine told me there is no problem after consulting their engineering staff.
I think best place to buy Stello is HIFI500 as you then have good customer service. Usually they respond to mails quickly, when that lady is around. They seems to be in the process of reorganizing the dealer network. First when I wanted to buy it they directed me to a UK dealer but the price was bit high there.