IF this amp and preamp are going in the same box, instead of building a whole separate power supply you could just use some regulators to get your -/+ 15V off of your amp power rails. I'm doing this with a sub amp I’m building. I used the ON-Semi MC78L15ABP, and MC79L15ABP regulators. I don’t know how it sounds yet but my voltmeter says it’s ok.
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