I've used a generic power supply from Maplin (UK electronics store) with no problem for several years. To select it, I just read the power specs on my Classic, and made sure to buy something that suited. I ended up buying a variable voltage model, with numerous connection tips that supplied enough current. I believe I got all the info I needed from the Classic itself - there should be a diagram by the connection point indicating voltage, current and the tip configuration. I imagine the B is the same.
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