2. analog
  3. 1144172162

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
tfkaudio OP
589 posts
 
Sberger,
Once you got the azimuth dialed in, where was the counter-weight setscrew? Mine is a couple millimeters right of dead center on the arm tube (looking down on the arm, standing in front of the table).
Just wondering if you and others arrived at the same place as I did...

Cheers.
sberger
146 posts
 
without looking at it, that sounds about right, maybe even a bit more. i know it's not dead center.
coffee_nudge
120 posts
 

Dodgealum:
I finally decided to install the mechanical antiskate on my Scoutmaster. My understanding is the same as TfkAudio's. The weight on the AS adjustment has a very small hex screw in it that holds it in place. You loosen that screw, and move the weight up and down the post. The manual that came with mine said to put the fishing line so that it is parallel with the table.

I would imagine that you can install this AS on a Scout, which has the junction box mounted on the plinth, rather than on the metal platform coming off the arm bearing housing, so that you would use a different position for the fishing line.

Anyway, that's my understanding. Maybe Mike will read this and chime in here.

Cheers.
coffee_nudge
120 posts
 
Tfkaudio:

I had the same frustration setting the azimuth (which by the way, I have not figured out why VPI makes us adjust the azimuth and the VTF with the same counterweight, so that as you adjust one, you skew the other!!). My setscrew ended up just about where yours did after a couple of hours of trial and error setting and resetting. I use the Dynavector DX 20.

Now that it is dialed in though, it sounds real good.

Cheers.
dodgealum
976 posts
 
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.
More to discover