Although I'm no authority in this regard, I understand that load impedance of the phono stage should be set to match the MC cartridge's impedance. So for R=30 ohms your load should match that. Anyone else concur?
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Trial and error might be your best bet. I currently use a Clearaudio Sigma that calls for 47k. I use the 100ohm setting instead. More musical, not at all strident (per the latest Absolute Sound review), excellent balance. While I haven't heard the audio research, cj, etc. this little thing is awfully good.