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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: 1,232
    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:OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/HexMat Eclipse/MN Bearing/Origin Live Gravity One puck/Isonoes with Boots/Jelco TK-850S Tonearm/Hana Umami Blue, PS Audio Stellar Phonostage. I also have an AT-OC9XSH as a spare cartridge.
    AMPLIFIER: Bryston BR-20 Pre/DAC/Streamer & Bryston 4B3 Power Amplifier
    SPEAKERS: Spendor D7 on Iso-Acoustics Gaia III’s
    HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W Pi7 S2 and B&W C5 v2.
    CABLES: Analogue: Speaker Atlas Mavros Grun. Interconnect - Atlas Mavros XLR x3, MCRU Silver Tonearm cable
    Digital:Audioquest Carbon Ethernet x 4, Audioquest Carbon digital, English Electric 8Switch, Chord Optichord, Atlas Optical.
    Mains: PS Audio Perfectwave AC-05 x 5, Isol-8 Powerline Extreme with Quantum Science yellow fuse on input cable, Sounds Fantastic 6way Mains Blocks.
    STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives. Samsung 500Gb SSD.
    TV LG55B7 OLED

  2. #2
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    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: 1,232
    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:OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/HexMat Eclipse/MN Bearing/Origin Live Gravity One puck/Isonoes with Boots/Jelco TK-850S Tonearm/Hana Umami Blue, PS Audio Stellar Phonostage. I also have an AT-OC9XSH as a spare cartridge.
    AMPLIFIER: Bryston BR-20 Pre/DAC/Streamer & Bryston 4B3 Power Amplifier
    SPEAKERS: Spendor D7 on Iso-Acoustics Gaia III’s
    HEADPHONES: OPPO PM-1 with Atlas Zeno cable, B&W Pi7 S2 and B&W C5 v2.
    CABLES: Analogue: Speaker Atlas Mavros Grun. Interconnect - Atlas Mavros XLR x3, MCRU Silver Tonearm cable
    Digital:Audioquest Carbon Ethernet x 4, Audioquest Carbon digital, English Electric 8Switch, Chord Optichord, Atlas Optical.
    Mains: PS Audio Perfectwave AC-05 x 5, Isol-8 Powerline Extreme with Quantum Science yellow fuse on input cable, Sounds Fantastic 6way Mains Blocks.
    STORAGE: Synology DS216J NAS with 2 x 3Tb WD Red hard-drives. Samsung 500Gb SSD.
    TV LG55B7 OLED

  4. #4
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    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: 2,814
    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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