Dual Power supply for my pre-amp

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The only question would be were your power supply caps over stressed? Most electrolytic caps have a reasonably large over voltage margin. Since you did not indicate that the power supply caps exploded, distorted shape, made a nasty smell or gushed cap juice all over your board. If your caps are rated for something close to 46 v and you didn't let the caps cook at that voltage you should be fine. But if it makes you fell better change them out. As I said it depends on the voltage rating on the caps used. If the caps you used were rated at 50v then you are good. Most caps over voltage rating is between 50 to 25 percent.
 
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