Nude Turntable Project

Nandric, Are the moderators THAT prudish? Shame on them.

Halcro, Good on you that you did not agree with Ct to use compliant footers. We are not so far apart in our thinking.

I discussed with Bill Thalmann your finding that the cage is ferrous and therefore attracted by a magnet. Bill agreed with me that it must be meant as an EMI/RFI shield to protect the outside world from RFI generated from the TT101. (The quartz crystal oscillator is a prime source of RFI. Maybe that's why the clock oscillator is also tucked up into the upper metal structure, away from the rest of the circuitry.) As to the fact that you've observed an effect of the motor on your new steel plinth, I would submit that the ferrous outer cage would also soak up the magnetic lines of force from the motor and also protect the outside world from the magnetics. (But I find it odd that the magnetic effect would be so strong, maybe from the transformer, in some way?) Grounding the cage provides a way to drain RFI to ground, as well as electrical grounding. If you don't ground it, it cannot work so well as a shield.

Lewm - Halcro, Good on you that you did not agree with Ct to use compliant footers. We are not so far apart in our thinking.

Lewm/Halcro – please tell me how my SP10 TT setup is compliant ?

The SP10 is bolted into the base at both ends as is the 20 - lb armpod using a recessed bolt. Both the SP10 and the Armpod are easily converted to spikes.

Here is a pic for you.
http://cgim.audiogon.com/i/vs/i/f/1368395046.jpg

Interested in your comments on how to improve it. Its been a neglected TT for too long. I haven't got around to making an aesthetic base for it yet.

cheers.

Chris,
Pneumatic or 'compliant' footers are designed solely to try to prevent the passage of Structure-Borne feedback into the turntable plinth/bearing/platter/tonearm/cartridge system.
Suspended turntables are an attempt to achieve the same result and can be somewhat successful compared to the alternative?
Suspended floor systems....whether timber-framed, steel-framed or reinforced concrete.....are all subject to Structure-Borne feedback which can suffer frequency transmission between 4-10 Hz and depending on amplitude.....can cause physical movement in the flooring system.
The more a compliant footer is compressed....the less successful it is in attenuating these low frequencies yet the less the footer is compressed....the more movement (in all planes) is possible.
That's why a Minus K stand is 'tuned' to specific weights and is able to move alarmingly when pushed?

Because of the problems in effectively designing an integral 'compliant' or 'sprung' footer system for turntables.....most new racks and shelving systems utilise a Stillpoints type of ball and cup isolation as well as constrained layer damping.
This Stillpoints type of footer is used for turntables, speakers and even amplifiers these days.

As you know that my turntable is placed on a masonry wall-mounted shelf and avoids any form of Structure-Borne feedback......I'm puzzled by your suggestion to 'improve' my set-up by using compliant footers?
In my situation....all this will do is introduce possible movement of the footers due to weight shifting of the tonearm and cartridge as well as temperature and humidity variations?
There is no possible 'up-side' to compliant footers if there is no Structure-Borne feedback.

Now if your system is sitting on a suspended floor-mounted rack or shelving system........there may be advantages to your method of support? :-)

Dear Lew, I forget alas your quote of the comment by Twain about Wagner but I have similar comment about our moderators. They are not as bad as they look. Propably little bit 'prudish' but well sportsmanlike because they allowed my post from 08-23-13 which was not very nice for them. However I fear that my panishment with moderator
approval is meant for life. They obviously have no idea how old I am.

Hi Henry - just as you heard a profound difference with the change in TT support and spikes on your masonry wall shelf.
You will also hear more difference if you put a shelf just big enough to hold the TT and armpods on your existing shelf and decouple it further. I used the word decouple not compliant. But I did reference the at-616.
This is what I meant by a dedicated shelf and I was selfishly wondering what it would sound like to you.
Just curious. I thought it would be fun.

I have found many times in this hobby that going against your beliefs can lead to interesting results.
As an example my old VPI JMW 12 tonearm never sounded better than when it was sitting on an armpod which sat on 3 symposium roller block jrs.
With the sp10 setup I showed. I can go from a spiked setup to a bolted in one in a couple of hours.

btw - Have you seen Des' (Dgob) most recent setup?
His sp10 is also on the wall. Guess what lies under it ?

Once you have used the AT-616's its hard to let them go.
probably work great under big amps too.
Continue to have fun and inspire ...

Ecir38 - I just saw your pics. very cool too. nice looking project.

Cheers