VPI Scoutmaster - Anti-skate again..


Hi,
I'm sure this has been covered, but I couldn't find it...

As we all know, the coiled wire of the JMW-9 tonearm provides anti-skate force naturally, and is seen by VPI as preferable to any mechanical implementation.

VPI now provides a mechanical anti-skate with the Scoutmaster turntable. It is supplied but not installed. VPI still stands by their original position on anti-skate.

Now, for my experience.

I started without the use of the mechanical anti-skate. Listening, backed up by the Hi-fi+ test LP, convinced me that more anti-skating force was needed. I twisted the lemo connector counter-clockwise to apply more force, but I didn't notice any difference.

I then implemented the mechanical anti-skate. I found by visual inspection and confirmed with the test LP that, even at the lowest setting, far too much anti-skating force was now being applied.

Listening tests with the mechanical anti-skate engaged were a mixed bag. I found the image to be more centered, rather than leaning to the right, but I also noticed a loss of fine detail. For instance, when a fast sequence of plucked guitar notes were played, each note stood out more independently WITHOUT the mechanical anti-skate. With the anti-skate engaged the notes smear together slightly.

Has anyone had a similar experience? I am hoping to find a solution that will enable me to focus the image better and not lose any detail. It seems to me that I need a way to provide a little more anti-skate, but not a lot more. (and I am slightly baffled as to why the lemo twist method seemed to have no effect whatsoever.)

Cheers.

Tom
tfkaudio

Showing 4 responses by dodgealum

I went through the process with my Scout/Dyna 20XH and, like you, found that the wire twist was not enough to handle the HFNRR test disc, though I thought the table sounded just fine to my ear. But the neurotic audiophile that sometimes rears his ugly head caused me to get the mechanical system to see if it would allow clear sailing on the test disc and potentially cause the sound to improve. Installed with the wire located midway up the shaft my arm/cartridge now tracks all but the last groove beautifully (and even the last one buzzes only some). As to the sound--I really don't hear a difference. So......it was an interesting exercise that, to my ears, left me in the same place (unless I break out my test disc for some really great "tones").
The mechanical anti-skate has a thin piece of fishing line that attaches to arm opposite the one with the weight at the base. This arm has about five spaced indents meant to catch the fishing line so you can adjust the amount of anti-skate force being exerted. On my setup the fishing line is on the middle indent therefore providing about 50% of the amount of anti-skate available. Hope this makes sense.
Tfkaudio. Interesting. Either we have different anti-skate rigs or one of us is wrong. First, the weight on mine does not slide along the post--it is fixed in position closest to the fulcrum. It is immovable. If it did move the amount of anti-skate added or subtracted by moving the weight would be extreme indeed. This is why you move the fishing line on the other post--it provides a much finer adjustment. If you are somehow moving the weight along the horizontal post you are adding (or subtracting) significant weight and this, I would offer, is why your sound is getting screwed up. Second, I do not understand your description of how to position the string. You say position it so that it is parallel to the table when the arm is in the rest. Given where it mounts this is going to be exactly the same for each and every table. Why make it adjustable at all if it serves no purpose other than to be parallel to the table?

I'm of the opinion that you use the position of the string to adjust the anti-skate and that the weight remains fixed in position. I could be wrong here but what you suggest doesn't make sense to me. I even went over to my table to try to pull the weight toward the outer end of the post--it won't move.

I'd really be interested in hearing from others or, better yet, Mike from VPI on this one.
After further inspection I believe you guys are right. I now see the set screws for adjusting the height of the entire assembly (so that you can make the fishing line parallel to the plinth) and the weight (so you can slide it along the shaft to adjust anti-skate force). I'm going to go yank my table out of the cabinet and play with these adjustments and see what happens.

Funny thing is the instructions that came with my anti-skate rig say nothing about adjusting these parameters--I just figured you adjusted the string height as a result.

Thanks everyone. I'll report back after I've made some changes and run the test disc again.