I wouldn't agree to avoid the coils on the Steelhead, I love the coiled coupled inputs, but I have tubed system. I hooked up solid state amps a couple of times, and what sounded good through tubed amps sounded almost phosphorescent with the solid state amps, so whether you use the MC or MM might be a matter of taste or system matching or the tubes you use in the 6922 slot. I find the MC input much more delicate and refined sounding on my system.
The internal impedance of the Lyra is about 5.5 ohms, so that would match with the 25 impedance setting if you use the MC input, but probably 100 or above with the MM input. It is easy to just listen to get the setting that sounds best, don't just rely on specs, that what you got the Steelhead for is its flexibility. You can leave the load capacitance at 0 with MC cartridges.
I believe that the 50 and 55 gain settings use just one half of the small triode, and the 60 and 65 settings use both halves, so you might try 55 and see if the sound is cleaner that way. I find that the 55 setting with MC sounds best overall, but they all sound great.
The internal impedance of the Lyra is about 5.5 ohms, so that would match with the 25 impedance setting if you use the MC input, but probably 100 or above with the MM input. It is easy to just listen to get the setting that sounds best, don't just rely on specs, that what you got the Steelhead for is its flexibility. You can leave the load capacitance at 0 with MC cartridges.
I believe that the 50 and 55 gain settings use just one half of the small triode, and the 60 and 65 settings use both halves, so you might try 55 and see if the sound is cleaner that way. I find that the 55 setting with MC sounds best overall, but they all sound great.