Nude Turntable Project

I just noticed that the url for the photo doesn't work - this one will take you to the album and the first photo is the one I was highlighting.

http://s1106.photobucket.com/albums/h373/Garya1/Nude%20Turntable%20and%20DIY%20Arm%20Pod/

Victor 101 -
Could you get rid of the flimsy bottom cover completely and mount the nude deck via an inverted tripod ? It doesn't look particularly rigid from the photos.
Potentially could you remove the internal transformer and some of the electronic boards from the main chassis and mount them separately to eliminate as much vibration as possible. Make sure all internal joints are as rigid as possible.
If you check out the Cotter and Kaneda versions of the SP10mk3 you can see what is possible in terms of stripping down to the bare essentials.

Although I would like to have all of the electronics mounted remotely it doesn't seem practical - it sounds to me like many hundreds of dollars and weeks of absence - after I find someone to do it. As far as the rigidity of the base goes it is one piece of pressed steel supporting 7 lbs or so. Not a problem.

Gary

Hi Gary,
Very interesting improvements and co-incidentally.......I have been testing and analysing the 'weakness' with the nude Victor as well.
As you have discovered.....the thin perforated metal circular surround is, I fear, the Achilles heel to supporting the Victors on spikes?
With the Technics SP10 models (as Chris has shown)..... it is possible (and preferable) to fit custom long tube spikes to the underside of the platter surround itself whereas it is exceedingly difficult to do with the Victors?
The problem is structure-borne feedback as is mostly the case with turntables?
Every supporting shelf is under 'stress' to some degree depending on its material, thickness and load, but most importantly.......on the 'span' and 'type' of span.
In my case with the wall-mounted shelf.........the cantilevered nature plus the heavy load and wood core structure sets up a particularly 'nasty' stress pattern.
What I have recently discovered is that 'stress' in any material....... creates a subsonic 'sound-field' within that material which is directly related to the 'level' of stress.
I previously thought.....wrongly I must admit.....that lower frequencies could not 'bridge' the pointy end of a spike support?
It is now known that they can and that spikes in fact 'couple' rather than 'de-couple'.
The 'stress-induced' sound waves in my cantilevered shelf are being transferred to the thin metal surround of the Victor which in turn passes them on the platter surround, motor and spindle support which the stylus then 'reads'?
This can be verified by placing the stylus on a record without turning on the motor......and then turning up the volume of the preamp until one can induce a loud low-frequency feedback loop through the speakers.
You, Gary.....have tackled the problem at the resultant culprit.....the metal surround which can work well.
I am going to attempt to tackle the problem at the 'source' by trying to prevent the transfer of this 'sound field' between shelf and turntable by isolation devices.
I'll keep you posted......:^)

Halcro, I see all improvements as cumulative. I agree that the shelf can have a huge effect and must be addressed. And it MAY be a good idea to support the TT at the original support ring. But no matter what else you improve, if you don't damp the tin-can you will still have problems. Even if you decide (heaven's forbid) to go back to a plinth even a wonderful slate and unobtanium plinth, you need to damp that can. I would also damp the chamber under the platter.

By the way, no matter how high I set the volume I don't get feedback. $7 and two hours and you will be much happier.

Gary