I need a +12v 0 -12v small wall mounted psu.

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I used to use some Xformers for telephone, and I have one wall-wart with 10+10 AC
( 12+12 indeed...), but I used to find 10+10 AC and 30 V more common, probably needed for routing modems & phones in the offices.
Simple full bridge + 2 caps with no regulation. It is not really needed for an amplifier
 
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