Running LOMC with MM (47K) loading

47 kohms is for moving magnets. I would use what is recommended by the cartridge manufacturer. My hana el calls for >400 ohms, I use 430. Not certain why you would exceed the value by 10's of thousands.

47K is the industry standard for all cartridges, MM or LOMC.

damping is not required for most MC cartridges (because their resonant peaks are now well outside of the audible range) except if those peaks result in overloading of the phono stage. 

^^ This. Overload of the input section of the phono stage can result in ticks and pops. That is a very real argument for looking for that phono section that does not require a load!

I don't see any mechanism for the electrical loading somehow affecting the mechanical movement of the cantilever. The loading acts as a voltage divider with some fraction of the signal diverted through the resistor to be dissipated as heat. 

Its not a feedback mechanism. You are working with a misconception. The loading is not a voltage divider; its directly across the output of the cartridge and in the input of the phono section.

When a magnetic motor or transducer is loaded, it has to do more work. That work comes at a price: its harder to make the transducer move. You can prove this easily to yourself because a loudspeaker is a moving coil device not unlike a cartridge (and can be used as a microphone in a pinch). Remove the speaker cable from the speaker and remove the grill cloth. Push on the woofer and see how easy it is to move. Now put a quarter across the speaker terminals so as to short them out. Try to move the woofer again. You'll see its less compliant. The same thing happens when you load a cartridge. Its simple physics. This was put more succinctly:

It is common knowledge that when you ship a speaker, you should short the terminals because it provides a "dynamic brake" which limits cone excursion from sudden impacts. A cartridge is simply a speaker in reverse and loading a MC can have a dynamic impact on the compliance.

In the case of the cartridge, where is the back emf or back emf increase by adding a loading resistor to the circuit? If there is any sort of back emf induced in the moving coil, it would be so negligible compared to the forces acting on the cantilever.

Because the cartridge is a transducer producing voltage from physical movement, there is no back EMF like there is in a speaker which is doing the exact opposite! The 'EMF' in this case isn't 'back', its 'forward' which is to say it **IS** the signal :)

When a cartridge manufacturer specifies a load less than 47K, its because they either don't realize that the load is really affecting how their reference preamp works, or more commonly, they know they can't predict which tonearm cable and phono preamp you are using. Because most phono preamps have stability problems, its wise for them to make some recommendation. They are probably assuming that the tonearm cable is only a meter in length, which in turn tells them that the capacitance of the cable probably does not exceed 100pF, since getting over 30pF/foot is unwise in a phono cable.

Thanks @atmasphere 

Much appreciated

Atmasphere,

Thank you for your explanation.  I understand that in the case of the speaker movement, that movement induces a current, which in turn, if you complete the circuit, creates a magnetic field that resists the movement of the speaker.  Could you expand further on the mechanism for resisting the motion of the cantilever?  Is it also the magnetic field generated by the coils in the cartridge?  As for conservation laws of simple physics, I can see the price being paid for the loading being paid by the electrical signal, but I don't quite understand why it has to be paid by resistance to the physical movement of the cantilever.

Jonathan Carr of Lyra, said, in a very long post in the What's Best Forum that when we load a cartridge;

"we don't affect what the cartridge does at all (unless the value of the load approaches or drops below the internal impedance of the cartridge).  What adding resistive loading at the phono stage input accomplishes is to dampen the resonant energy of the ultrasonic spike, and give the phono stage an operating environment that isn't so likely to trigger any latent non-linearity tendencies that the phono stage circuitry may have.  

For the reasons given, the phrase "cartridge load" is misleading.  "Phono stage input terminator" is a better description of what really happens."

I am wondering what aspects of his comments you agree with or disagree with.  I regard you both as experts in this field.

Thanks.

The reference was made to ECC81 to help explain why there may have been a need to use the VC at a full rotation.
The arrangement of Tubes and Brand Selection of Tubes used with the Phonostage are a result of it being Bespoke Produced for me with trials on other Tube Configurations and Brands having been undertaken.
ECC83's were rejected by myself as a Input Valve.
The design allows for the usage 83's, and I knew that the 83 would allow for more Gain with the LMOC.  
As said, the outcome of using the Cart Direct to Phonostge or via a SUT
has not created anything unwanted, when it comes to Sound Quality.
There are Two Presentations available from one Cartridge.