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ARSCLIST  December 2020

ARSCLIST December 2020

Subject:

Re: Adjusting Anti-Skate

From:

Gennady Lyskin <[log in to unmask]>

Reply-To:

Gennady Lyskin <[log in to unmask]>

Date:

Wed, 23 Dec 2020 13:11:40 +1300

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (131 lines)

Hi Eric,

Yes, it is. I can see the difference. 
If after my adjustments, I put the stylus on the flat portion of the SAME LP, it moves to the centre of LP quite fast independently on the tonearm position.
The disk has 3 flat portions at the beginning, middle and the end of tracks. The same action is on both 3 portions.
Changing the Vert-Force (V-F) I found those "magic" points, wrote-down the A-S scale correction table for this particular setup.
Next time when I change V-F, I'm right on spot.
At least it works for me. I'm with TTs for about 60 years. Will never use any other method.

Best regards,

Gennady Lyskin

G e n n L a b
http://www.gennlab.com
[log in to unmask]
Tel: +64 21 238 3056
New Zealand
  ----- Original Message ----- 
  From: Eric Jacobs 
  To: Gennady Lyskin 
  Cc: Association for Recorded Sound Discussion List 
  Sent: Wednesday, December 23, 2020 12:43 PM
  Subject: Re: [ARSCLIST] Adjusting Anti-Skate


  Hi Gennady,


  Do you see a meaningful difference between the A-S required for the inner vs the outer grooves when adjusting A-S with your test disc and oscilloscope?


  ~ Eric


  On Tue, Dec 22, 2020 at 2:51 PM Gennady Lyskin <[log in to unmask]> wrote:

    Hi Corey,

    The goal for A-S adjustments is to set equal DINAMIC pressure of stylus tip 
    on both walls of the grove.

    I’m using test LPs from CBS Labs and the other brands.

    Some of them contain a few tracks with gradually increasing 300 or 315 Hz 
    signal from high but still usable lateral +11 dB ref. 1.12x e-3 cm peak 
    amplitude to super high unrealistic lateral cut level of +18 dB ref.

    I adjust A-S force to the point when the stylus tip looses contact with both 
    walls simultaneously.

    2-CH oscilloscope connected to the L and R OUTPUT terminals of the preamp 
    must show symmetrical distortion of the sine wave peak in both channels.

    It is always different from the flat portion of the disk method and way away 
    from the A-S scale.

    My Benz Micro Glider SL MC cart on the Technics SL-1200MK2-XAL TT can pass 
    +18 dB with 2.0 g vertical force with very low visible and audible 
    distortion.

    The other carts like Stanton, Ortofon, Audio Tec. etc cannot pass even +14 
    dB test with recommended Vertical Force.

    If you interested, please have a look at my website transfer LPs page what 
    test LPs I use.



    Happy Holidays,


    Best regards,

    Gennady Lyskin

    G e n n L a b
    http://www.gennlab.com
    [log in to unmask]
    Tel: +64 21 238 3056
    New Zealand
    ----- Original Message ----- 
    From: "Corey Bailey" <[log in to unmask]>
    To: <[log in to unmask]>
    Sent: Wednesday, December 23, 2020 10:08 AM
    Subject: [ARSCLIST] Adjusting Anti-Skate


    > Hi All,
    >
    > OK, I’m going to open up a can of worms here…………………
    >
    > Most turntables have an anti-skate adjustment. Some do not & some have a 
    > counterweight suspended from a thread (which, is surprisingly accurate). I 
    > learned years ago that the anti-skate (A-S) adjustment should be 9 to 11 % 
    > of the vertical tracking force (VTF).
    >
    > Once the turntable is set up & with everything properly adjusted, my 
    > method has been to adjust the A-S by playing a blank disc (usually a 
    > lacquer) & set the A-S so that the tonearm tracks steadily in the middle 
    > of the disc. A slight drift towards the center is desirable but generally 
    > difficult to achieve. When digital recording became the norm, I began 
    > visually & audibly checking the fades for all of the material being 
    > transferred from disc to make sure the modulation is equal (unless it is 
    > intended otherwise). When I purchased my 1^st set of AES Coarse Groove 
    > Calibration discs, (AES-S001-064) I was pleasantly surprised to find a 
    > generous band of no modulation in the center of the discs although there 
    > is no mention that it is to be used for A-S adjustment.
    >
    > I recently read that an easy way to adjust A-S is to adjust it so that the 
    > tone arm stays steady in the dead wax area of the record to be played. I 
    > tried this & found that when the tone arm is placed in the center of a 
    > blank disc, the tone arm travels to the outside of the disc.
    >
    > So, what’s the correct adjustment? I thought I’d ask the experts on this 
    > forum: How do you adjust anti-skate? Do you use sophisticated measurement 
    > tools? Comments? Opinions?
    >
    > Happy Holidays,
    >
    > CB
    >
    > Corey Bailey Audio Engineering
    >
    > www.baileyzone.net 


    -- 
    This email has been checked for viruses by AVG.
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