A Copernican View of the Turntable System

Dear Lewn - you can have the most precise and accurate platter/motor assembly - but once you put that crude piece of vinyl on top with all its imperfections - all bets are off.

I have found through this approach that all you want the platter/motor to do is maintain correct speed and drain its own resonances.

Once the isolated (armpod, tonearm, cartridge, stylus) picks up that signal from the vinyl - its on its own merry way and says bye bye to the platter in a continuing cycle.

If your tonearm is mounted on the same platform as your platter/motor, you need to ensure your system is able to deal with the returning vibrations/resonances from the tonearm. Hence we have some very elaborate systems as a ways of doing this.

This is too complicated and cumbersome and $$$ for me – and the reason I like the simple isolated armpod approach. Once my armpod gets rid of resonances, the last thing I want is the resonances returning to play havoc.

Sorry for not presenting this in a more scientific way for some of the members here but this is what I understand to be happening.

We break that resonance loop with the isolated armpod.

The members here using this approach have heard the difference between the two.

Chris,

I failed to notice that the original suggestion was to try the rollerblock "juniors". These should indeed be far more stable under mechanical interactions than the normal rollerblocks (which I use). Nandric is correct that you'll have to suck it and see and I thjink you are right to give them a go. Maybe you could even talk to the people at Symposium first. Anyway, there is a set of juniors for sale on eBay now ($90).

Good luck with your experimentation and do let us know how it goes.

Chris,

Sorry, just one other brief thought.

If you look at the details and approach of the Equarack people, you'll see there is a major concern about mass loading/weight of component to get the best out of viscoelastic supports. As I mentioned above, I had major problems when trying noted components on one of my Symposium platforms and so you might want to look into this weight compliance factor in making your decision. Athough, at only $90 you might just think it as well to just get them and experiment!?

Either way, I look forward to hearing how it performs in your rig.

One 16 lb (7.27kgs) Solid Brass Cylinder - 4" x 4"
$152.55 dollars

Brass bolt to secure tonearm to cylinder .15 cents

Steel spikes / discs to couple the arm pod $20 dollars

Drill bit and tap for making threaded holes for 3 spikes and one bolt. $15

Brass Polish $5 dollars

Unbiased, unsolicited, comments and recommendations from Audigon members - PRICELESS

You can see the raw brass piece here.

http://www.canuckaudiomart.com/view_userimages.php?user_id=5181&image_id=41998

I will try it out this weekend and if it sounds promising I will bring it to a machine shop to round it out and take out the fine scratches

Cheers Chris

Dgob - I have no problem being the guinea pig. Will try to source some locally first. I have found in the past when talking with some of these manufacturers of these products that their experiences with what we are doing is limited.
They can't seem to say yes or no to me and their feedback is very general and ambiquous.

Geoch and his audio community are obviously there already. His comments are based on the Jrs. actual experiences with people so I trust his input as been unbiased. And besides as you say they are not alot of money - again about the price of a tank of gas :)

Geoch - I do have two questions

Are there any guidelines about the weight. Have your members found there is a minimum and maximum weight with the Jrs. and is there a limitation on the height of the object.

Also you mentioned that these are used by the parallel trackers but why not the Pivot arm or any other - since they are balanced as well.
Thinking of the pivot arm I am getting visions of a construction crane on a tower swinging over a job site.