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In Reply to: RE: Any advantage to having a bigger trafo on headphone amp? posted by mr.bear on June 30, 2017 at 14:06:57
Way back in the 80s I owned a PS Audio IV preamp with phono stage that had an optional large outboard transformer as an upgrade. It sounded way better. The stock one was bigger than a wall wort but this one was from a power amplifier. Lower impedance power supply? Don't know.
And here it is again (Asylum link below). A quote from Paul McGowan in a Stereophile interview, explaining how Stan Warren "discovered" that a more current capable power transformer sounded better.
You nailed it, Barry. McGowan said the improvement was due to the larger transformer's "very low secondary impedance".
I've always tried to build my power supplies with far more than necessary current capability (when possible) because of this. A five amp transformer doesn't cost all that much more than a one amp, in the big scheme of things. Getting it to fit in an enclosure is another matter though.
Inside that Asylum post is a link to the whole Stereophile interview with McGowan, where I got the quote.
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