Phono pre amp

So vdH is making the calculation for you in recommending a tonearm with 14g effective mass.  That should not be taken as a firm directive.  12 to 16g would be fine.  Note that effective mass should include the weight of the headshell, the cartridge itself, and the screws/nuts that hold the cartridge in the headshell.  Most tonearm effective mass specs will include the mass of the OEM headshell. Since all those other items are out on the end of the lever, they can pretty much be added to the mfg spec by simple arithmetic. If you use an aftermarket headshell that differs in weight from that of stock, just add or subtract accordingly, in grams.  I've got to disagree with MC on the idea that "any" phono stage would be adequately driven by 0.65mV output.  Just off the top of my head, I would say you need at least 55-60db gain.  My main point is that a typical MM phono stage will not do the trick.  Those typically supply 40 to 50db, max.  

I’m very happy with my Tavish Design Classic phono preamp. Cheap by high end standards, dealing with the owner of the company is a pleasure.

https://tavishdesign.com/products/classic-vacuum-tube-phono-stage

I’ve been using a Musical Fidelity MX-VYNL phono stage for several years. I went through several stages before that, including the GCPH from PS Audio, but I have a hard time imagining how any stage at any price could "sound" (it has no apparent intrinsic "sound") or function better. It’s fully balanced with both balanced & unbalanced inputs AND outputs, easily adjustable and configurable for both MC & MM carts, and it’s built like an anvil. It can even be powered by a battery pack, although I could hear no difference. It may no longer be in production, but it retails for $1,000 new and in my (limited) experience it was/is a steal at the price. Worth looking for and a BIG step up from the Yamaha stage.

Does anyone have experience with the Graham Slee line of phono pre,s?

Get the tube box ds2 by pro-ject. It can handle both mc and mm as well as two turntables. Its a Tubed phono preamp and it is a wonderful piece of kit. I own one with the wood sides, eucalyptus. Its beautiful.

This is just one of many phono stages I possess. Another great one is the Tavish design the classic or the vintage. Made in the USA by Tavish design, NY. Also a Tubed phono stage. If using a low output mc cartridge, I would highly recommend that you also purchase a step up transformer. The jensen SUT’s are fabulous for about $600. Made in USA. Positive feedback has a wonderful review of the Jensen mc 2RR-L. Take the output of the transformer and connect to the mm section of either of the two above phono stages, or whichever you settle on. This is the Best way to utilize a mc cartridge. However the aforementioned ds2 does allow you to adjust the mc cartridge load on the fly by utilization of the front mounted knob. Pretty neat actually. Lastly... A very cheap but yet very good option is the musical fidelity lx-lps. It too can control two turntables and is equipped with both mm and mc inputs. It has a very beautiful midrange. It is very well built and small. Getting a bit scarce but still available.
Just a heads up, the best bang for your buck moving coil cartridge is the Hana EL. It's the new "103" so to speak.