cartridge weights/spacers?

Discussion in 'Turntables' started by ferninando, Mar 20, 2017.

  1. ferninando

    ferninando AK Subscriber Subscriber

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    How to tell when to use those flat metal weight/spacers when installing a cartridge?
    What are the critical parameters?
    Thanks
     
  2. Jack P

    Jack P Member

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    Location:
    Great Britain
    To add mass in order to work better with the carts compliance and also to achieve correct SRA or VTA
     
  3. ferninando

    ferninando AK Subscriber Subscriber

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    define SRA pls.
    how to know if you need more mass?
    So you can use those spacers for tonearms without any VTA adjustment?
    Is that to get the TA to sit flat during balancing?
     
  4. Jack P

    Jack P Member

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    Location:
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    Sorry, I should have done that. SRA is Stylus Rake Angle. This same thing really as VTA or Vertical Tracking Angle.
    What you need to know is your arms effective mass and your carts dynamic compliance. You can plug these numbers into an online calculator like this one https://www.vinylengine.com/cartridge_resonance_evaluator.php
    For example, my SME 3009 arm has an effective mass of 12.5 so if I put that figure into the calculator it will show the resonance of carts based on there compliance. The green area is what you want to aim for.
    If your cart needs to be heavier, add some weights to the headshell which will increase effective mass allowing less compliant carts to be used. If the cart is high compliance then the reverse is true, less weight.
    Hope this makes sense. :)
     
  5. ferninando

    ferninando AK Subscriber Subscriber

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    OK thanks for that. My technics SLD2does not give compliance sepcs of the tonearm.
    I do know the comp. of the cart tho.
    what is high comp. and low comp.
    I have not the foggyest.
    thanks for the info so far.
    Im in a learning mode.
     
  6. Jack P

    Jack P Member

    Messages:
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    Location:
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    Well, to try and put it in real world terms, High compliance carts allow for lighter tracking force so if your cart tracks at .5 to 1 gram its high compliance and needs a low effective mass arm such as the SME series III which has an effective mass of around 5 grams.
    If your cart is looking for a tracking force of say, 1.75 to 2.00 grams a medium mass arm would be fine and so on.
    I am not familiar with your turntable but I would guess from an image on google that it is a medium mass arm so should suit a wide range of carts.
    The reason for all this is to get the resonant frequency (the point at which the arms mass and the carts suspension start to oscillate or bounce around and causes miss tracking and audible warbling.) in the right area so it is not a problem.

    I am a firm believer in trying it out so, if you have some weights, try them, rebalance the arm and see if you like it. In some cases, a bit more mass can sometimes improve the things.

    What is the cart your using?
     
  7. ferninando

    ferninando AK Subscriber Subscriber

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    AT122LP. 1-1.5g tf
    TT tf from 0-2.5g spec.
    sounds hi comp. to me.
    I have weights and will try them
    thanks
     
  8. KentTeffeteller

    KentTeffeteller Gimpus Stereophilus!

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    Your SL-D2 is medium mass/medium compliance.
     
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  9. ferninando

    ferninando AK Subscriber Subscriber

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    thanks Kent.
    can you say where you found this info?
     
  10. mhainz

    mhainz Well-Known Member

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    Your SL/D2 tonearm has an effective mass of 12grams (without cartridge). This info is in the user manual.

    Are you sure about the cart? AT122LP is a p-mount.
     
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  11. ferninando

    ferninando AK Subscriber Subscriber

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    I only have the svc mnl which doesnt give that info. will try getting th user mnl.
    it is printed on the cart 'AT122LP' is all I know.
    Thanks for the info

    PS: any sugestions on a cart upgrade?
     
  12. mhainz

    mhainz Well-Known Member

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    Location:
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    You can download the manual from vinylengine.com

    Any chance of a photo of your cartridge?
     
  13. ferninando

    ferninando AK Subscriber Subscriber

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    Hi Mhainz. Just got done dn'ldng the user mnl. the svc mnl did have the arm mass.
    And to my surprise I discovered that the AT122 cart is in fact a P-mount with an mount adapter.
    In addition the vinylengine info also revealed it. something I missed when I 1st got the thing.
    So that issue has been resolved.
    let me now if you still want a pic. I can do 1 later.
    I dont really need an upgrade as I have a few other good carts in my stash I can use as I please.
    But always open to sugestions.
    Thanks for getting my head screwed down.
     
  14. KentTeffeteller

    KentTeffeteller Gimpus Stereophilus!

    Messages:
    23,591
    Location:
    Athens, TN
    Looks like you have a T4p mount cartridge in a 1/2" adapter. Not uncommon. A bit too light for the arm for optimal warp tracking.
     
  15. ferninando

    ferninando AK Subscriber Subscriber

    Messages:
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    Location:
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    aint no warped records in my coral.
    your take on the mount is rite tho.
    I didnt realize it was like that. Looked normal to me altho abit diff.
    It all looked to be meant for the arm.
    If I get any tracking problems I can always add a tad bit of weight as I have
    a fist full of weights and spacers from many yrs accumulation not nowing what to do with them.
    Before I was using a SME/II arm and a V15/II ona TD124/II TT and all was joy and happiness.. no weights and measures needed.
    that was some yrs ago. all gone now but still happy with the new old toys I have now.
    A happy mix of tube and SS stuff. and some marvelous Monitor Audio GOLD 20 spkrs from england.
     

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