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Thread: Odd tonearm - turntable set up, advice requested

  1. #1
    Join Date: Mar 2011

    Location: Herne Hill, London, UK

    Posts: 55
    I'm Neil.

    Default Odd tonearm - turntable set up, advice requested

    I'm hoping that some of the resident turntable gurus could cast some light on the issue I have with a recent TT buy as illustrated on images below.

    The pivot to spindle distance measures just over 220mm with effective length around 240mm but the only way of getting even close to any alignment is by pushing the cartridge as far back as it will go. Am I missing something obvious or is the tonearm mounted in the wrong position?

    Its an Opus3 Continuo, with unknown arm, may be a one off but appears well made (unipivot) and I would have thought whoever made it had a decent understanding of set-up geometry.





    Any advice gratefully received,

    Cheers

    Neil

  2. #2
    Join Date: Mar 2014

    Location: West Wales

    Posts: 843
    I'm malcolm.

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    I wonder if this originally had the parallel tracking arm which has been replaced by this unknown one but has used the same mounting hole whereas it should have had a slightly longer pivot to spindle mounting distance/
    Audiophile Tosher

  3. #3
    Join Date: Mar 2011

    Location: Herne Hill, London, UK

    Posts: 55
    I'm Neil.

    Default

    That’s exactly what I was wondering...there’s a clean hole and just 3 fixings so it’s not been adapted to fit, in which case that would be a bit annoying

    If it is the case, what is the best way of calculating pivot-spindle length from effective length (and is there a way of accurately determining it from arm measurement- pivot to end of head shell mid point or that minus x mm to normal stylus/overhang position?). Luckily the slots are long and it should be easy enough to relocate the arm position without it being visible.

  4. #4
    Join Date: Sep 2017

    Location: Chichester, West Sussex UK

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    I'm John.

    Default

    Try 211mm (Linn geometry).

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  5. #5
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,850
    I'm openingabottleofwine.

    Default

    Are there no marks or labels on the tonearm to identify it?

    If you can identify the tonearm, then you can find the details of the arm's geometry using vinylengine.com, from which one can calculate the two null radii.
    Barry

  6. #6
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    Quote Originally Posted by Barry View Post
    Are there no marks or labels on the tonearm to identify it?.
    I'm fairly sure I saw these offered on ebay by a Chinese/HK seller a couple of years ago. They caught my attention as they looked well made.

    A poke about on AliExpress may find something similar.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  7. #7
    Join Date: Mar 2011

    Location: Herne Hill, London, UK

    Posts: 55
    I'm Neil.

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    Thanks all,

    I'll have a look around. It does look well made, the counterweight is set on a micrometer screw which gives nice, accurate VTF adjustment.

    I have measured the EL at 240mm, which suggests P-S of 222.3mm, and re-reading the Feickert its actually around 215, so its definitely in the wrong location...better get the drill press warmed up!

  8. #8
    Join Date: Mar 2011

    Location: Herne Hill, London, UK

    Posts: 55
    I'm Neil.

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    AliExpress revealed this looks like an early version of the FFYX tonearms. Same weight mech, similar detailing elsewhere, no info on set up but looks straightforward to reset and the head shell slots are long enough to allow a bit of leeway.

    Thanks for info all,

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