JLTi phono stage
is absolutely amazing for MM with optional loading for MM, if you will ask the designer to make custom change (for free) you will be able to use MM/MI not only with 47k Ohm loading, but with 100kOhm loading.
There is also an MC input which is very nice. Also optional loading.
It's very simple Solid State device using something that is called Diamond Transistor Theory, rarely used on High-End Audio products. The most simple and linear audio voltage amplification device is a Vacuum Triode which consists of three electrodes only. They are the Grid (input), Cathode (grounding) and Anode (output). On the other hand, the Solid State Transistor is a current device but is nowhere near as linear as the Triode. It consists of Base (input), Emitter (grounding) and Collector (output). The idea behind a Diamond Transistor is actually a composite circuit that emulates the near perfect and linear Transistor as a current device with the same three electrodes in the circuit then becomes the equivalent of the Base, Emitter and Collector followed by a Unity Gain Buffer. The JLTi Phono Stage is at once a very advanced concept and yet also elegant in its simplicity when executed properly. The Power Supply is pure Class A Constant Current “SuperReg” as developed by Vacuum State Electronics and now increasingly been copied in High-End Audio.
The JLTi Phono Stage is easy and straightforward in operation. It does not have any On/Off Switch and designed to be left permanently On. Only when away on holidays, it may be advisable to disconnect from the Mains Supply (same as with other electrical appliances).