One turntable with two arms, or two turntables with one each - which would you prefer?

"Dogberry, what phono stage provides 5 pairs of phono inputs?"

Five inputs are available in the huge and delightful Musical Fidelity NuVistor Vinyl. It remembers what you have set for each one (each can be MM - with eight capacitative loading settings, or MC - with eight resistance loadings, +6dB or no - which helps to make the output similar such that by changing from one table/tonearm to another you don't have to dash to the pre-amp to alter the volume).

best groove

I nearly bought the hard to find JVC Victor CL-P3 Three arm-board plinth.

Luckily, the seller showed a ruler in the photos, and I realized: in order to get a 3rd removable arm board on the left, and not be too wide overall, they moved the main arm board on the right side closer to the TT by cutting the arm board into a curved shape.

Luckily I realized, my 12.5" long arm will not fit. My CL-P2 plinth main armboard is further away, allows my longer spindle to pivot length needed. I’m not sure what the longest arm a CL-P3 fits.

Victor's 7082 long arm is actually only 270 s/p and 12mm overhang: total effective length 282mm (11-1/8")

my blackbird needs 304mm s/p plus 13mm overhang: 317mm effective length (12.5")

@pindac Have you tried slate? I have a 50mm Pennsylvania slate plinth under my rebuilt Garrard 401 with excellent results. interestingly, I tried granite and found it to sound quite poor.

I have a very nice Slab of 30mm Thick Slate, that I purchased which would produce Two Plinths.

Since my moving away from Massey Plinths, I have not been motivated to use it, or concern myself with learning how it works in comparison to Granite or Corian.

A Granite Plinth has not been experienced for quite some time, and this was with a Garrard 401. The PTP Solid Nine is readily available mounted on Corian.

I only use the PTP now to introduce others to the Idler Drive system and do the odd comparison to show how the TT drives can produce different sonic signatures.

I see the PTP as a very successful method to be used on an Idler Drive system, and in fairness, it is possibly the best use of the amalgamation of a modern design meeting design from an olden era.

I am at present excited about an upcoming experience I will be introduced to.

I see the PTP Design and the Kaneta Design as both coming from a similar line of thought, which is to have the engine decoupled from it usual mounting and attached to a material that is much more suitable for the purpose.

I have been instrumental in presenting this design to individuals who are with the Skill Set in both machining and electronics to produce this design for the SP10 MkII.        

The Kaneta Design produced from Densified Wood will be in place for myself to receive a demonstration very soon.

Additionally, it is to be produced to have a New Design Platter.

The Kaneta Design is flexible with Platters, which enables this version to be used with a variety of Platters, i.e, Original, Original Modified, New Design (Acetal with Increased Inertia and a Gunmetal Platter. 

The Design is to enable up to Three Tonearms mounted of which one can be a 12" Inch design.

This one has been a long time in the waiting to experience, it is a whole new territory of investigation, and I am chuffed at the thought of it now coming to fruit.

There is also a great opportunity be made available, to compare Tonearms against each other, as within my Group, there are a selection of sought after Branded Tonearms and Bespoke Produce Designed Arms.

Even better is that there are MC Cart's of the same Brand/Models with similar hours that can be donated to get the most from the new experiences to be encountered.   

I have built several TT plinths - here are my observations 

Panzerholz is not stable -it can warp and I would only use it in conjunction with another material that is dimensionally stable.

Granite - rings - no matter how thick.

Slate is ok, doesn't ring like granite due to its stratafied structure.

2 Materials that  I have had very good results with are

Engineered Stone ( high quality euro ) 95% quartz. Relatively easy to cut, you can source it cheaply from kitchen bench manufacturers ( offcuts ). Some have CNC facilities which makes it a doddle.

Compressed high density Bamboo ply. It is 50% more dense than Maple, and dimensionally very stable. I use this with my modified Garrard 301 and the result is exceptional. Even my mate with a Kuzma M/4point combo was gobsmacked when he heard my modded Garrard 301 with my compressed bamboo ply/birch ply hybrid plinth - medium mass, rigid, inert.