Thorens TD-124 cartridge?

Marginal but possible, compliance of 10x5 is 12 so medium compliance. The RMG's are heavy stuff but you might just get away with it.

How would a Dynavector 10x5 match up?

Yes, it is strange to advertise the arm as 12" but in fact it's not wrong perse just a bit confusing as we generally understand the advertised length as referring to pivot to stylus length. :) I've never seen an arm add that advertises it's total length with counterweight included! Interesting add, thanks!

wow...can it more confusing I wonder.

Yes and if you look at the data it says "12 inch over all" (that is with the counter weight) Lateral lenght= 9 1/8 inch. It's all in the name.. 212 is for 212mm or 9 1/8 th inch and 309 is for 309mm or 12 inch.

check the link provided in my earlier response.

Well, what I'm really wonderin is what a 12 inch rmg-212 is ? As the 12 inch would be called a 309 but even so they were both designed with SPU compliance in mind.

True. I was wondering if that was what your were insinuating.

p.s. that's why I added it in brackets ;)

I know but it's a medium (14) compliance cartridge.

The 304 is not an MM. Its an MC.

I don't know why people are suggesting low compliance carts ,like all the MM's in the list above, for a heavy arm like the RMG-212??? (and that includes the DL 304!)

Good. I have had the 304 on my TD-160 Super before and it was an excellent combination. I had a different arm though (cant remember which). Yours would be a good match. http://www.hifisupply.co.uk/scans/ortofon_catalogue_3.jpg

with the project phono tube se II amp I should be able to achieve 55 db with the switch jumpers on the back.

Denon 304. Very low output though (.18mv I think). MC. You will need min 55db amplification from phono pre.

As well as the MM Ortofons, the medium/hi weight MCs, Bluepoint Sp., SPU, shure, AT, clearaudio except for their top line... Some that are'NT a good idea:
Lyra Titan, Lyra Connoisseur, Transfiguration Opus....

Anything you like will work well, really. Prefer cartridges that favour the upper frequencies. Regards

Denon DL103