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Thread: What is the effective mass of a Jelco TK850S + HS-30 Headshell?

  1. #1
    Join Date: Jul 2013

    Location: Kingsbury, NW London

    Posts: 1,113
    I'm Clive.

    Default What is the effective mass of a Jelco TK850S + HS-30 Headshell?

    The effective mass of arm and standard HS-25 headshell is 13.4gm but the HS-30 headshell is 4.8gm heavier than the standard HS-25 headshell. Hence my question.
    SOURCE:Auralic Aries G1, OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/Achromat/MN Bearing/Isonoes with Boots/Jelco TK-850S Tonearm/AT-OC9XSH or Hana SL, PS Audio NuWave Phono Converter
    DAC: Chord Qutest, Chord Mojo/Poly
    AMPLIFIER: Bryston BP17-3 Pre & Bryston 4B3 Power
    SPEAKERS: Spendor D7.
    HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W C5 v2
    CABLES: Analogue: Speaker - Chord Signature. Interconnect - Atlas Mavros XLR x2, Atlas Mavros Ultra, Chord Indigo Plus XLR, MCRU Silver Tonearm cable
    Digital: Atlas Mavros Ultra x2, Atlas USB, Chord Optichord.
    Mains: Chord Power Chord x2, Black Rhodium Libra/MK/Shurter or Wattgate x4, IsoTek Orion 6 way, Sounds Fantastic 6way Mains Blocks.
    STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives.
    TV LG55B7 OLED

  2. #2
    Join Date: Jan 2009

    Location: Essex

    Posts: 21,203
    I'm openingabottleofwine.

    Default

    To a very good approximation it will be 13.4g + 4.8g, that is 18.2g.
    Barry

  3. #3
    Join Date: Jul 2013

    Location: Kingsbury, NW London

    Posts: 1,113
    I'm Clive.

    Default

    Quote Originally Posted by Barry View Post
    To a very good approximation it will be 13.4g + 4.8g, that is 18.2g.
    That’s what I thought but it sounded too easy.
    SOURCE:Auralic Aries G1, OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/Achromat/MN Bearing/Isonoes with Boots/Jelco TK-850S Tonearm/AT-OC9XSH or Hana SL, PS Audio NuWave Phono Converter
    DAC: Chord Qutest, Chord Mojo/Poly
    AMPLIFIER: Bryston BP17-3 Pre & Bryston 4B3 Power
    SPEAKERS: Spendor D7.
    HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W C5 v2
    CABLES: Analogue: Speaker - Chord Signature. Interconnect - Atlas Mavros XLR x2, Atlas Mavros Ultra, Chord Indigo Plus XLR, MCRU Silver Tonearm cable
    Digital: Atlas Mavros Ultra x2, Atlas USB, Chord Optichord.
    Mains: Chord Power Chord x2, Black Rhodium Libra/MK/Shurter or Wattgate x4, IsoTek Orion 6 way, Sounds Fantastic 6way Mains Blocks.
    STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives.
    TV LG55B7 OLED

  4. #4
    Join Date: Jan 2009

    Location: Essex

    Posts: 21,203
    I'm openingabottleofwine.

    Default

    It may look 'too easy', but it is good enough to use to estimate the low frequency arm/cartridge resonance.
    Barry

  5. #5
    Join Date: Jan 2009

    Location: Norwich

    Posts: 2,696
    I'm Hugo.

    Default

    The additional effective mass will be slightly less than the actual weight difference because we are talking about inertia rather than actual mass, but as Barry says the simple and easy estimation is good enough for resonance calculations.

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