Nude Turntable Project

Hi Aigenga,
Thanks for posting those pictures which were illuminating.
As your set-up is now nearly identical to mine......it would be interesting to compare some differences?
Firstly.....is the base for the turntable/armboard mounted on a floor stand or off a wall shelf?
Secondly....I can understand why you elected to use the Micro Seiki armboard and then had to attach it to your 'pod'......but to me, there a few compromises in that set-up which you may be able to change to see if you can detect any differences?
The cantilever affect of the Micro armboard will inevitably increase any vibrations /movements over a 'directly' located arm to armpod by a factor of eight or even more depending on the length of cantilever.
Secondly.....my armpods are mounted on 'spikes' whilst yours are 'attached' with double-sided tape?
I know that Chris......who has also 'nuded' his SP10MkII.......initially had his on sorbothane feet until cleverly achieving stainless steel spiked legs.
As you similarly have done......perhaps there might be a difference with spiked armpods over 'attached' armpods?
What do you think?

Halcro,
Yes, I agree that a cantilever will magnify vibration and it is a new thought for me. Micro Seiki and many other manufacturers have used this approach for decades and this MS arm board is made out of a very heavy copper alloy that will dampen the 'diving board' effect considerably. So perhaps it isn't that much of a problem?

The double-stick tape is mostly for holding geometry on a very slippery surface. I could put the base of the pod on 'tip-toes' and use tape under the cups like I did under the turntable.

I have designed another pod made from heavy stainless steel that I will show once I've got it together - 3 weeks or so. It will be a straight vertical design so I will have another data point.

Last night I put two heavy rubber straps around the lower portion of the table - pictures soon (maybe before you read this). It was a worthwhile change as I noted a loss of 'cupped hands' coloration.

I also want to mention that I have changed the mat. It is now a 1lb lead mat from Merrill glued to the bottom of a thick Achromat. Best I've heard.

Gary

Halcro,
I added two photos: the rubber strapped turntable and the component rack. The rack is cast iron, stands seven feet tall and is 3 feet wide. It weighs 200 lbs maybe 300. I am considering building a wall shelf and integrating it into the rack at the level where the TT is now. Yet another project.
Gary

Gary, I will chime in here by saying that you need to copy the same material used by Halcro when it comes to armpod. Anything else will just be good but not to the level of sonics performance of that of Halcro. He seemed to me the only person that I know of to have the most correct material.

Audpulse, I do what I can. My cantilevered arm pod looks somewhat like the arm boards on Halcro's Raven. .

I've thought more about taping the pod to the granite slab vs putting it on points. My current thought is that taping it makes it one with the slab from a mass perspective and points will isolate it. I am going to try both but I am betting that the massive approach is preferable - a 40lb arm board seems good to me.

Gary