Suggestions for phono preamp for LOMC's

I always thought the definition (of RFI) depends upon the source, not the frequency of the spurious tone, but I will of course yield to your superior knowledge. Thanks.

Ralph, Do you equate the resonance frequency generated by the inductance of the cartridge being in parallel with the capacitance at the inputs with RFI? I never thought of it that way, as I always thought of RFI as noise that comes from an external source either by radiation through air or by injection into the circuit wiring. The capacity of the phono circuit to deal with the high frequency resonance generated in the cartridge/phono system is identical to its capacity to deal with RFI, I guess.

But does the Modwright use a built in SUT in order to achieve adequate gain for an LOMC, or not?

Not enough gain is often a problem with the lowest output of LOMCs, like less than 0.3mV @ 5cm/sec.  However, I cannot recall ever having a problem with too much gain, if we restrict the discussion to LOMC cartridges and MC inputs. And what most forget is to add in any gain from an active linestage.

When one uses the phrase,” specifically designed for MC cartridges”, what does that mean? I assume it means that the phono stage has gain sufficient to allow the use of a low output moving coil cartridge without the need for a step up transformer (at least 60 db gain). This is in contrast to phono stages that have a built-in step up transformer for LOMCs, driving a moving magnet (low) gain stage (typically 40-50 db). Is that correct?

Check out he recent thread on SUTs. There you will find mention of good high gain phono stages that are compatible with LOMC cartridges. Also I suggest you read up on “gain”, the meaning of db, etc, so you can calculate how much gain is enough for a given cartridge. That quantity also depends upon linestage gain, amplifier input sensitivity, and speaker efficiency. 
 

The TZ Vibe is a current driven device. Such devices work best with LOMC cartridges that also have a very low internal resistance, usually less than 10 ohms. So before you purchase a current driven phono (there are others besides the Vibe) be sure you want to limit yourself to compatible LOMC cartridges.