Ever tried with an old Märklin transformator? I know it's not an ideal solution, but for example my dad made an old turntable which, wasn't intended for current feed from the plug in the wall, but from the amplifier most likely, work with that. What I don't know is if the transformator is regulating the voltage or the amps tho... I also have no idea what how much amps it puts out... the sign on the transformator says 10 W but I guess that's the power drain from the plug in the wall.
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