Instructables

Protect Your Records By Shock Proofing Your Turntable

In their jackets, your record collection is pretty safe.  It's when they're on your turntable when the chances of being destroyed are greatest.  Probably the most common way records are ruined is when someone carelessly or accidentally bumps the table or cabinet the turntable is setting on.  It doesn't take much energy to get the tonearm to bounce across a pristine vinyl disk.

These remarkable turntable feet are capable of totally eliminating all horizontal shock from your support surface to your turntable.  These feet also include minimim point contact with your support surface, reducing vertical vibration energy as well. These feet will isolate your turntable and precious records from all the world's movement.

The feet are easy to make, will fit any turntable and drop jaws when you demonstrate how well they work.
 
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Step 1: A Visual Description...

Rather than attempt to explain the concept behind this gadget, I made a short demonstration video. I shot underneath the table to prove there's nothing other than the legs holding it up. Even with me messing with the legs, the record continues to play with no distortion of any kind.



In the video, I move the feet slowly. If they were to be "flicked", like they would in an accidental bump, the torque on the balls would be greater, causing them to break free from a standing position much quicker. In other words, the faster the motion, the better the feet work.

The next video shows me violently moving all the legs at the same time. I wack the substrate they're setting on with a mallet creating movement like there'd be in an accidental bump... At the same time, risking my AT440MLa cartridge, so I must be confident in my engineering... Enjoy.


As you can see, there's no energy passed from the feet to the turntable deck. Stronger magnets and glass plates on top and bottom of the BBs may allow more movement than what my feet allow, but what are the chances of that happening? :)

UPDATE:
This video was missing for a bit... Evidently, ASCAP didn't like me playing 30 seconds of Skeeter Davis' "End of the World"

so they shut the sound off on my video... Kinda sophomoric, when the idea behind the video was to hear the sound.   This is the replacement, using classier music than what ASCAP had anyway.  Enjoy.






Question, I saw the first diagram, and saw that you recess the magnet in the internal block, what does the magnet do? Does it kepp the ball bearing from moving around to much? Can I use a neodimium magnet?
bfk (author)  k7classicrockfan1 year ago
Hi. The answer to both of your questions is "yes".

Without the magnet, it would be madening trying to set 4 feet up and having BBs rolling all over the place. Magnets also ensure the BBs stay close to the center of the glass plates where they'll be most efficient.

I've purchased some neodimium magnets myself with the intension of replacing the lower steel plate and weak magnets I used in my prototype. That was a couple of years ago. My setup doesn't really need the stronger magnets enough to go through the trouble of changing them. If I were to be building a set of feet from scratch, I'd definitely use the stronger magnets between 2 sheets of glass.

Thanks for your interest in this.
gzuckier2 years ago
Another good alternative to removable putty is "Mortite" a brand name for a similar substance, sold in hardware stores for caulking, etc. Used to use it for things like smearing a thin coat onto the sheet metal frames of speaker drivers to eliminate their resonance, before cast frames came into being.
bfk (author)  gzuckier2 years ago
Thank you for the information. I'll check that stuff out.