Isolation platforms for turntables

Sorry 11flat6 regarding your compatibility problems with the passive Vibraplane. When I sell these units (now more than 6,000 sold world-wide) I never would sell a passive version to anyone that was going to use it with a linear tracking tonearm. I myself have owned the ET2 tonearm and know what you are talking about.

(Dealer disclaimer)

12-20-13: Altanpsx
Bconero117 i think vibraplane is an electron microscpe platform, and it costs 2-4 kish. But it has its own problems like air pump tanks etc... If it worths sure i may consider.

VP is made for microscopes. I own a few and they are reliable from Day one.
But there is one detail to think about, NEVER move the VP when the feet are filled. All air loss is based on that mistake. But this is noticed in the manual.
When they are new and filled first, the air hoses will be stretched a little bit, so refill has to be done about 2 or 3 times after 2 weeks, when the hoses have their final diameter all is stable. For mine I refill them probably all 4 months.
Car Tires for example need a check too, based on diffusion.
The VP can also ordered in active version (compressor).

There are 2 mechanical problems to deal with though I don't know what turntable you are using.

To solve a potential problem with footfalls causing the arm to dance across a record, mount the turntable on the wall (mine it to the left of the speaker system), or wedge the stand or furniture it is on to the wall behind it.

To test for feedback, place the needle on a stationary record and turn up the volume. If there is a howl, by far the cheapest solution is to visit a bicycle shop and purchase a small inner tube (14-18"), partially fill it, place a board on it and the turntable on top. Your feedback problems should be solved.

A further note: do not play records with the dust cover down. It tends to amplify air-born sound coming from the speakers.

Dctom wrote,

"I have built my own - very high mass plus anti vibration material and springs. I have no feedback issues at all now."

I'm a big fan of high mass/spring systems. One reason is they are rather uncomplicated plus you can obtain very low resonant frequencies. I'm also fond of dual-layer iso systems with two heavy masses, such as bluestone, and two layers of springs.

I've had excellent results with my Gingko Audio platforms. The difference between a Symposium platform and the Gingko was drastic.