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Thread: How do you measure rumble through a bearing?

  1. #1
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

    Default How do you measure rumble through a bearing?

    I've always wondered this and thought it might be quite useful to measure with respects to seeing how some of the home brew bearing designs and tweaks measure up against the big boys.
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    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

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  2. #2
    Join Date: Jan 2009

    Location: Deleted

    Posts: 6,585
    I'm Deleted.

    Default How do you measure rumble through a bearing?

    The easiest (though not necessarily the best) way is to use a test record with a fixed tone - record it onto your laptop and compare the frequency spectrums in Audacity.

    Of course you need an appropriate test record, a laptop (or nearby computer) and Audacity (though that is free to download).
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  3. #3
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    I'd have thought a record with no tone, just a blank groove would be the thing. Or an accelerometer bearing down on the top of the platter spindle maybe?

    There's always a chance of rumble being on the record, produced by the cutting lathe.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  4. #4
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

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    Ok, so recommend me a good test record
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

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    Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker



  5. #5
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    The old HFS 69 record has a rumble test and silent grooves. I have a copy, it has its uses.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  6. #6
    Join Date: Jan 2017

    Location: Bristol

    Posts: 111
    I'm Clive.

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    The Hi-Fi Choice reviews in the late 80's used a precision "rumble decouple" system from Thorens.

    This thread discusses the subject

    http://www.diyaudio.com/forums/analo...ng-rumble.html

  7. #7
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

    Default

    Thanks, looks like I might have a dabble.
    SS
    CD Teac VRDS25X(Audiotuned) DECK 1210 Mat Crystal Audio Mods MN Base/Bearing/Platter+Ebony armboard Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/3 Stage Regs/Recap PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black FGS CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    VALVE
    PRE
    Croft Epoch(Modded) AMP Sondex S100 (Modded) SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Ref XO + Batpure supertweeters DECK Garrard 301 Mat Teunto Bearings 401(Bastin) Plinth Bamboo Arms 3009/3012 PSU Eagle+Tachometer MC Ag Meister II/FGS + Ortofon SPU MONO CABLES Arm Yannis 420.5 Litz+ SpeakerPC Tripple C+WBT-0681 Ag IC Oyaide FTVS-510 AgWBT 0110Ag Phonostages Paradise(4 Box Mega-Modded) / Croft Musicmaker



  8. #8
    Join Date: May 2011

    Location: Glasgow

    Posts: 7,718
    I'm Brian.

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    I for one would be very interested in your findings Andy . I'm still using the original bearing on my GL75 .
    Regards
    Brian

    Sell your cleverness and buy bewilderment . (Rumi )


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  9. #9
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    The old Celestion Ditton 66 and Ditton 25 speakers would demonstrate turntable rumble. If the amplifier had little or no bass roll off, the bass driver and ABR would oscillate out of phase (it was below system resonance) to rumble very visibly.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  10. #10
    Join Date: Jan 2017

    Location: Bristol

    Posts: 111
    I'm Clive.

    Default

    Quote Originally Posted by walpurgis View Post
    The old HFS 69 record has a rumble test and silent grooves. I have a copy, it has its uses.
    Just checked and all 5 of the test records I have include a test for rumble using unmodulated grooves.

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