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Ok

R-Core transformer is often used in analog equipment for high current output with more power in compact size.

Actually, Audio Research implements them in low current line level devices like the REF 2 Phono and DAC9 for audio stages while using conventional transformers for relays, display and microprocessor controls. Both my older DAC8 and SP20 use them as well. While you frequently see power amps using toroidals, I can't recall ever seeing one using an R-core.

FWIW, the HDPlex unit recommended by Sonore uses but one transformer in its design.

I find it ironic that others seem to disagree with this statement of yours: "When you use 1A, you should have transformer capable of sending 2A at least for optimal performance."

I was castigated by one inmate for using a 2A power supply for the uRendu: "It is not 'optimal' for powering a device needing only a fraction of the current."

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