Yes. We did a shoot out of a VAC Ren Mk2 phono vs a Rhea Signature. All 5 agreed that the Rhea was not in the same league as the inboard VAC phono stage.
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The phono board in my prior Renaissance III was awesome (though bypassing the internal MC SUT with a Bob's Devices 1131 was a big upgrade). Very quiet, with a beautifully balanced and detailed sound, slightly on the warm side of neutral. I'm not surprised the Sig IIa's phono reportedly kicks ass. Getting the MM stage in these units seems like a very good idea.
Well, if RH uses it as his reference, he clearly has never heard Nick Doshi's phono stages, which are a step up even from the VAC. Maybe it's a synergy or rather lack thereof w ZYX carts, but even the owner of the Rhea was amazed at the difference. We compared the Rhea, VAC, a ZYX Artisan, Doshi, and Manley Steelhead. This was several years ago so I can't say what the specific differences were, but there was no question that the Doshi was the best, the VAC just a touch behind, and the Manley and ZYX a touch behind the VAC. It might not be fair to say the Rhea was embarrassed, but it was definitely outclassed.
As an owner of the VAC Signature 2a with phono I'd give a thumbs up to adding the phono. I had an Audio Research PH-7 and the VAC phono outclassed it in every way; detail, extension, musicality, naturalness, etc. I have gotten to know Kevin Hayes better over the last several years and know he favors LP playback to digital (although his first DAC still sounds better than many new DACs today) and he designed the phono stage inside the Signature 2a to please his ear! You won't be disappointed. To be sure, hang onto the Rhea, give the Signature a few hundred hours of break in and then decide for yourself. You can tube roll the phono stage too if you want to someday experiment with different presentation.
Skinzy, since you have a low output MM, you would select the MC input selector on the phono Kevin installs and play with the ohms setting once you have it connected. Call Kevin Hayes at VAC and discuss my suggestion, but I think you will be fine. You will use the MC option so you will have a boost in output. If you ever buy a higher output cartridge, then the MM input. Good luck and happy listening.