Help! New TT skipping badly....


Recently bought a used VPI Scout with JMW arm  9 in.  Set up on shelf om my SolidSteel rack where I have always had a TT. Could barely breathe without arm skipping. If I walk anywhere near rack, skips. Floor is carpeted over hardwood, quite solid, never had issue with Clear Audio or Rega table. Took to Audio Connection and had completely gone over and adjusted. Better but still bad. Put cork /sorbathane blocks on shelf and put 3 inch solid maple slab on top of that. No change. removed top shelf and put the cork/ sorb. blocks directly on frame, then maple slab. still skips. everything is dead nuts level, and as stated, floor is firm. Went in basement and put a brace between floor joists, nada. Tomorrow I was thinking of taking rack down and removing spiked feet. Odds this helps? I know some will suggest wall mount, but I don't want to spend anymore money if I can avoid it.As I said, Ive had other TTs in exact spot and you could dance with never a problem. Any input would be greatly appreciated.As I said TT was recently gone over and is set up correctly. Thanks
winoguy17

Showing 4 responses by millercarbon

Any time. VPI must be frustrating after the way it worked with CA and Rega. Would be curious to know if Pods would take care of it. I know the sound will improve, a lot, but would it eliminate this devil of a problem? So bad it almost makes me wonder if there is something wrong with that table. It is used you know?
With springs it is essential to tune in order to match the load to the springs. If they are too stiff they won't isolate much, and that may be what is going on here. Looking at what you've got to play with, I would try springs under the 3" thick butcher block, with the turntable on top of that. Add or remove springs until they are compressed about half way under load. When properly loaded, when you give the whole thing a push it should bounce or oscillate fairly slowly. In addition to adding/subtracting springs you can also weight the shelf, with anything such as a bag of sugar being fine for a test.  

As good as Nobsound work, one of their bigger shortcomings besides lack of damping is they really only isolate best up and down. Because of the number of springs and the way they are arranged they have a lot of stiffness side to side and in other planes than vertical. Without being there it is hard to know but you may have a situation where the rack is rocking front to back or something like that more so than up and down. If that is the case you can get better by tuning Nobsound but the real solution will be Townshend Pods or Platform, those isolate equally in all planes. 
Already provided two solutions- three, if you want to count springs under the rack. Which you seem to not have read anything I posted. One more try.

The problem is not the floor. If the floor was so unstable then you would have had problems with those other tables. The problem is the frequency of vibration going up the rack into the table is right in a range this particular table is unable to handle.  

The solution is springs. Thanks.

I was going to say Townshend Platform until "don’t want to spend money" at which point we are SOL. Even a sand box costs money! Your answer is springs. The other stuff you are doing, no amount of cork or sorbothane ever gonna fix this. Nobsound springs are dirt cheap- $30 per set of four. Then when you realize springs are the answer hopefully the next step is to realize really well engineered springs will be even better, at which point you get the Platform and are amazed, and move the Nobsound to some other components. Because for sure they are better than whatever is under them now.  

You can also talk to John Hannant at Townshend about getting some springs for the rack. This is not "off the shelf" but they have done stuff like this for others, are helping someone I know right now in fact. You can also do both. The Platform is probably the easier thing to try first.