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Know-how of refusing an external power supply for a top-level phono preamplifier. Budget unusual circuitry without integrated LM317/337 stabilizers and monstrous power transformers. Links to the circuits and ordering components here / masterklass-po-119094569 ********** Know-how of refusing an external power supply for a top-level phono preamplifier. Budget unusual circuitry without integrated LM317/337 stabilizers and monstrous power transformers. Links to the circuits and ordering components here / masterklass-po-119094569