Yeah, those specs for the ThinkPad power supply might actually be just fine. I've heard of people successfully using ThinkPad power supplies to run their empegs, although I don't know if they were that exact model or not.
Tha's actually what I'm doing quite frequently (both with the power supply of my old 30X (?) and current T40P.
On the T40P powersupply is printed: Output 16V DC, 4.5A

Jelle
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Empeg M2A Blue # 010101908 80Gb
Empeg M2A Blue # 030102771 with backlight buttons - Need repair (IDE cable connection on main board) - volunteers?