Calculation verification please

By normal convention "40/40" means 40 divided by 40, which is 1.  Just so not to confuse anyone, you probably meant 40-squared or 40 X 40, or 1600. 600,000 divided by 1600 (or 600,000/1600) equals 375 ohms, the load that Skos desires. I know you know that but some might have been confused by the way you wrote it. That Rogue with a built in option for a 1Megohm input impedance on its MM stage would work too, but 47K works as well.

Good point overlooked by me and everyone else: What LOMC requires a 1:40 SUT? If you guessed correctly that it is a Mysoniclabs with 0,5mV output, then your point is very well taken. 20mV of signal voltage at the standard stylus velocity will definitely overload nearly any MM phono stage, because the stylus velocity can go way higher than the standard 3.54 cm/sec or 5.0 cm/sec (the two standards for which cartridge output is calculated).  To justify a 1:40 SUT, you would expect that the cartridge output is not more than 0.15mV or preferably less.

By normal convention "40/40" means 40 divided by 40, which is 1.

Good point - division is not associative. Indeed I meant ((1 MEG / 40) / 40), same as applying the div operator strictly left-to-right without groupings. 

@sksos1 could you share which cartridge you're using? 1.4 ohm coils are fairly unsual, and "usually" a good match to 40x SUT - but not if it's an MSL, which are extra unusual cartridges.

Perhaps off topic, but does anyone know how MSL gets as much as 0.5 mV from only 1.4 ohm coils? No other cartridge maker gets close to this ratio. MSL's marketing blurb goes like "magic SH-μX core", but it's hard to believe a core material could net that much more generator efficient versus iron-based cores of other manufacturers. Could they possibly be using larger-than-usual gauge coil wire, which nets more mass but lower DC ohms for a given number of turns? If so, that feels like "cheating" 

Magnets and their proximity to the coils plus core material must be how they do it. The math for such calculations is complex, and I don’t know the equations. So off the top of my head, I can’t be amazed unless I knew the math and physics involved.

Dear @sksos1  : Other that the LOMC cartridges are not sensible to load changes and with all respect I can't understand that you want to use a SUT when you own an active high gain phonolinepreamp. Just my curiosity.

Any cartridge will sound and performs with higher quality levels in that phonolinepreamp than in any SUT at any price where the best that can does the SUT the BEST is to degrade the quality sensible cartridge signal. So you will listen a degraded quality sound through any SUT.

In the other side as @lewm  posted you are really better that a bat hwn can hear differences between  between a difference of only 36 ohms whe the cartridge is insensible to changes on load impedance. Makes sense to you what you are listen it? or maybe is what you just want to hear. Obviously that's what you like and is ok for me or any one else.

Regards and enjoy the MUSIC NOT DISTORTIONS,

R.

By my calculations, I load the cartridge to what sounds best to me.