Triplanar RCA out to Balanced out for MP-1

Dear Lewm,Not everyone is as fearless as you are.But if I blow up my loudspeakers (those are my 'babys') I will kill myself or be killed by flying pieces of beryllium.I own the
Usher BE-20. So this hobby of my is literally toxic and, regarding my bank-account,also insane.
But if your Triplanar is also 'model' VII then I know what to do.
'Interesting',to use your expression,the former model VI(?)
has visible shield connection with the arm-mass.
Thanks and regards,

Nandric,
If you are unwilling to attempt a rewire and intend to keep the components you now have (I'm a happy AtmaSphere MA-1 amp owner and LOVE the sound!), I suggest you contact Albert at Space Tech Labs about adding one of his tube buffer/RCA-balanced converters.
My phono stage is single ended in/out. As well, the turntable and phono stage are both on a side wall stand, 10 feet from my line stage. The line stage is balanced in/out for best use with the Atma amps.
I bought Albert's "BUF-101", which is both buffer and RCA-balanced converter, as I have many spares of the tubes it uses (6X5 and 6L6).
Bottom line: I connect a 0.5m RCA pair from phono stage to the "BUF-101" RCA input, and use a 4m balanced (Mogami) cable pair into my line stage. The "BUF-101" is sonically transparent and I have no hum, despite the long XLR cable run that crosses several power cables en route to the line stage. I'd previously tried RCA-XLR adapters - hum city! I love the way my analog source now sounds.
The "BUF-101" costs a bit over $500USD and Albert may may recommend a less expensive of his converters for your particular application/gear.
This option only puts a bit of cash at risk.
Just my 2 cents...

Nandric, You made me think. The shield for the Triplanar tonearm wires contacts the tonearm body where via the clamp at the base of the mount. So in effect, the shield per se grounds the tonearm body to the preamp. This may be why I never needed to attach the tonearm ground wire to anything. Conversely, I isolated the phono wire shield from the RS-A1 body, where the wires exit thru the holes formerly occupied by the RCA jacks. This may be why I needed to create a separate ground between RS-A1 and MP1. By the way, the hum that I did have with the RS-A1 was annoying but very benign. Not at all capable of damaging a speaker. Moreover, the frequency of hum is way below anything seen by your beryllium tweeter. Fear not.

Lewm and Nandric, this is why I recommend that the tone arm ground wire and the shield both be tied to pin 1 of the XLR. No hum problems! I have even used Kimber wire between the arm and preamp (using an SME V, not a Triplanar) and no hum at all.

A phono cartridge is a naturally balanced source and does not need a special circuit to convert it to balanced operation- just the right hookup.

Dear Lewm, You underrate my Usher BE-20 because they also
'possess' an beryllium 'mid-speaker' and not only.as you suggest, the tweeter. I payd 17.000 Euro for the 'babys' and want everyone to know. According to me you own the
'old' Triplanar VI(?) because I also had this 'model' and
know about the 'shield-connection' to the arm-mass. But because you are in the USA and I in Europa I am not scare of you. Sadly I am not totaly sure about that.In any case I will not mess with the ground-wire because I have bad experience with connection to the pre-ground.
But I was more scared by the proposal of Jb0194. Say 'adding up' solution. I own Emitter II Exclusive + Basis Exclusive + transformers + batterys. In my living-space there is a kind of German artillery situated and I
really think that I have some right for some space for myself. So sorry Jb0194. I know you mean well but there are
limits even for an HI-FI nuts.

Regards,