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Thread: Unstable Tracking Force Conundrum- a ghost in the machine ?

  1. #21
    Join Date: Aug 2009

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    Quote Originally Posted by scotty38 View Post
    Agreed but I had assumed you couldn't tell (no markings??) based on considering other options. Having said that how does a heavier weight fix the issue that the current one is moving as I don't see the correlation?
    Because it will be a lot nearer the pivot and fully inserted in the arm tube.


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  2. #22
    Join Date: Nov 2011

    Location: Seaton, Devon, UK

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    I'm Adrian.

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    Quote Originally Posted by worrasf View Post
    Adrian

    While the counterweight is at the very rear of the arm it is clear of the dust cover in its tracking arc. Also, I don't close the lid as the Brueil record weight is too tall.

    I do think though that the issue is likely related the counterweight being so far away from the arm pivot. Unfortunately, I am not aware of a heavier counterweight for this arm.

    Even though we have not yet reached a definitive reason for the problem I am sensing that the received expert opinion is that it is unlikely to be due to the cartridge suspension which supports Terence's view.

    Steve
    With my Timestep headshell and Benz Micro LP-S my tracking weight is very near the end of its adjustment, which is to be expected based on the specifications I think it is within 2gm of the limit.

    A simple think to try out would be to get a small amount of blu-tack say 3-4gm and out it onto the counter-weight, them balance out the arm, zero the gauge and the then set it for your tracking weight and then see it it remains stable.

    Before you do the above see if you can easily slide the counter-weight back, you should not be able to do so if it engaged on the thread, so if it isn't then you have exceeded what it can do with the existing counter-weight.
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  3. #23
    Join Date: Aug 2009

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    Quote Originally Posted by AJSki2fly View Post
    A simple think to try out would be to get a small amount of blu-tack say 3-4gm and out it onto the counter-weight, them balance out the arm, zero the gauge and the then set it for your tracking weight and then see it it remains stable.
    Good suggestion that.
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  4. #24
    Join Date: Dec 2017

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    Quote Originally Posted by worrasf View Post
    Because it will be a lot nearer the pivot and fully inserted in the arm tube.


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    Ah ok, I'd not realised it was set up like that, fair enough makes sense.

  5. #25
    Join Date: Feb 2013

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    if its partially off the stem that will cause issues with it moving.. meantime try a little plumbers tape. might just give it enough grip
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  6. #26
    Join Date: Aug 2009

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    Quote Originally Posted by struth View Post
    meantime try a little plumbers tape. might just give it enough grip
    Another good suggestion
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  7. #27
    Join Date: Jan 2008

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    Interesting conundrum, and I agree that the cart. cannot be responsible except inasmuch as it may generate a lot more energy that your others.

    I had the same thing happen on my 12" PU7, when the VTF would inexplicable change (can't remember if it was lighter or heavier though). The P U7's counterweight is secured by grub-screws, and although feeling tight, they weren't, causing drift over a few records.

    Don't know your Jelco, but think it may be a grooved/twist affair with no locking, but the principle remains and I think Adrian, Martin et al are on the right track in suggesting masking tape or whatever to secure it. Sounds improbable for such a counterweight to be able to creep, but this and the cart. weight/higher VTF/energy effect on the counterweight is at least a feasible possibility.

  8. #28
    Join Date: Aug 2009

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    Quote Originally Posted by Mike Reed View Post
    Interesting conundrum, and I agree that the cart. cannot be responsible except inasmuch as it may generate a lot more energy that your others.

    I had the same thing happen on my 12" PU7, when the VTF would inexplicable change (can't remember if it was lighter or heavier though). The P U7's counterweight is secured by grub-screws, and although feeling tight, they weren't, causing drift over a few records.

    Don't know your Jelco, but think it may be a grooved/twist affair with no locking, but the principle remains and I think Adrian, Martin et al are on the right track in suggesting masking tape or whatever to secure it. Sounds improbable for such a counterweight to be able to creep, but this and the cart. weight/higher VTF/energy effect on the counterweight is at least a feasible possibility.
    Thanks - Yes I agree it must be the counterweight slipping. Hugo Cass informed me earlier there is no heavy counterweight available and Iíve not seen anything from the likes of Isokinetic. Iíll try the ďtapeĒ method at some stage and if successful maybe try and commission a custom weight.

    Thanks to all the ghost busters

    Steve


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  9. #29
    Join Date: Nov 2011

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    Quote Originally Posted by worrasf View Post
    Thanks - Yes I agree it must be the counterweight slipping. Hugo Cass informed me earlier there is no heavy counterweight available and I’ve not seen anything from the likes of Isokinetic. I’ll try the “tape” method at some stage and if successful maybe try and commission a custom weight.

    Thanks to all the ghost busters

    Steve


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    See if it is magnetic and if so just add a small magnet or two to the rear, could save a lot of cost.
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    Listening is the act of aural discrimination and dissemination of sound, and accepting you get it wrong sometimes


    Pro-Ject Signature 10 TT & arm, Benz Micro LP-S & Michel Cusis MC cartridge, Furutech AG-12-R4 High Performance Phono Cable, LFD MMC special phono stage, Rothwell MCX SUT, RaspberryPi/HifiBerry Digi to Beresford Caiman SEG DAC, Sony 3d blu-Ray for CDs to Caiman SEG, ALLNIC T1500 MKII SET 300B amp, Tannoy Legacy Arden speakers and JBL L100 Century's , Chord Epic speaker leads, & signature links, the Eccose Conductor CA1 cd to pre, I think I am at audio nirvana, but donít tell anyone

  10. #30
    Join Date: Dec 2017

    Location: Lincolnshire

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    I'm Martin.

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    Might be obvious but I assume the sleeve is fully on the arm and that the weight is towards the rear of the sleeve. Ie you don't have the weight forward and the sleeve hanging off the back....

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