@glennewdick
Most MM manufactures build for 47k ohms you would get more out of the MM cart by having selectable capacitance. MC you want selectable resistance (or as we say loading it).
This is not true, nearly ALL top quality MM cartridges are made for 47-100k Ohm preamps and this stated in the manuals for all the best cartridges made by Grace, Victor, Audio-Technica etc. If you don’t know this plz just search online. Nowadays nobody cares about MM cartridges that much like it was the the 70s/80s.
I have had one of the best Dynavector (high output) and Audio-Technica MC ART-2000 wich is much better than OC9. They are good cartridges, but all of them must be re-tipped and that’s not cheap. All those LOMC require an expensive MC preamp or an expensive SUT. High output MC are sensitive to loading. This is all too complicated and much more expensive than a decent MM cartridge!
And as i said when you change 47k resistors to 100k resistors none of those MC will sound any better than MM cartridge. Instead of spending $500-1000 for a SUT or to pay extra for MC preamp, anyone can spend $36 for Vishay Naked Foil 100k resistors first.
Instead of paying $500 for retip anyone can use replacement stylus for MM cartridges for less with the most advanced cantilevers (beryllium) and diamonds like Shibata. Styli for the AT20SLa still available.
Also your MC cartridges are mid compliance, while the AT20SLa is a high compliance cartridge with much better tracking ability.
The MM cartridge is the FIRST THING to try if the budget is limited and also must have for anyone who still believe that more expensive MC is superior. It will be not easy to find a multi thousands MC cartridge to beat reasonably priced MM carts like Audio-Technica AT-ML170, Grace F14, Pioneer PC-1000 mk2, Glanz MFG-61, Victor X-1 or X-1II ... just to name a few. And the prices for all of them are $600-1500 even if they are NOS in the boxes. Garott Brothers still makes great MM cartridges, i believe SoundSmith MI cartridges are also very good for those who would like to avoid any used cartridges.
It’s easy to ignore all that SUT game and LOMC stuff, additional cables, very expensive high gain phono preamps etc. The high output MC are inferior to the LOMC in most cases.
So what is the reason you’re recommending an average MC cartridge to a person with $600 budget? And why not to upgrade the phono stage if it cost just $36 for the best audio resistors ever made and 15 minutes of soldering time?
There is a lecture of Peter Ledermann of the SoundSmith online, he could explain better why MC should be avoided, he’s the one who repaired many thousands of them.
https://youtu.be/F65mODzn4GkI don’t understand all that hype about LOMC cartridges even with my own experience with some of the "very good" LOMC such as Zyx Airy, Zyx Premium 4D, Ortofon MC2000, Fidelity-Research FR-7f, PMC-3 ... and various HOMC cartridges.
It’s much easier to make your MM cartridge sounds great first (and it is sounds great) before investing serious cash for LOMC, then it’s easy to be dissapointed about the whole myth of LOMC, compared to some nice vintage MM and MI.
