Art Dudley didn't think so when listening to the MC-4.
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Yeah, there's no switching mechanism on the MC-3 (or the newer MC-4), so all 3 inputs are direct connections to the primary taps - hence my concern. It's a great sounding versatile SUT; just trying to save some cable swapping if there's no penalty or risk to that.
Cartridges include Koetsu stones (5 ohms), Shelter Harmony (15 ohms), Benz LPS (38 ohms) - yes I know the Benz is probably better off with a JFET head-amp.