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Thread: 401 pitch instability issue

  1. #1
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,125
    I'm Adam.

    Default 401 pitch instability issue

    Garrard 401 pitch instability issue... Cry for advice!!
    Can anyone shed some light on why the strobe should
    Stray left and then right and will not stay still?

    Making good piano ballads sound a bit Les Dawson ish
    Thoughts?!
    "lack of passion is fatal"

    Vinyl: Garrard 401, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GTE /Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Miyajima Zero B 0.7mil mono / Vintage GE VRII mono / Amps: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture sapele rack

  2. #2
    Join Date: Aug 2008

    Location: Suffolk, UK

    Posts: 1,338
    I'm Paul.

    Default

    The strobe indicators on my 401 are not perfectly spaced, so there is some minor shifting back and forth. Also speed stability only really becomes rock solid after about 45, when everything has warmed up.

    If you are having a major speed stability issue it could be a few things. Has the rubber idler wheel perished? Also the motor pulley can become polished over time which stops the idler wheel have the correct traction. Wiping the inside of the platter with some IPA can help too.

    Also you can have bearing issues, I tend to oil mine every few months and every few years strip it down and clean it. Also I check all the springs as some of these tension the idler wheel against the pulley and he platter.
    ~Paul~

  3. #3
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,125
    I'm Adam.

    Default

    Quote Originally Posted by Primalsea View Post
    The strobe indicators on my 401 are not perfectly spaced, so there is some minor shifting back and forth. Also speed stability only really becomes rock solid after about 45, when everything has warmed up.

    If you are having a major speed stability issue it could be a few things. Has the rubber idler wheel perished? Also the motor pulley can become polished over time which stops the idler wheel have the correct traction. Wiping the inside of the platter with some IPA can help too.

    Also you can have bearing issues, I tend to oil mine every few months and every few years strip it down and clean it. Also I check all the springs as some of these tension the idler wheel against the pulley and he platter.
    Thanks Paul appreciate the advice
    "lack of passion is fatal"

    Vinyl: Garrard 401, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GTE /Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Miyajima Zero B 0.7mil mono / Vintage GE VRII mono / Amps: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture sapele rack

  4. #4
    Join Date: Jul 2009

    Location: Hampshire, UK

    Posts: 2,375
    I'm Buriedunderaloadofturntables.

    Default

    Also, make sure the eddy current brake disc isn't warped or damaged. It must be perfectly flat to do its job properly.
    Adam.

  5. #5
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,125
    I'm Adam.

    Default

    Quote Originally Posted by Beobloke View Post
    Also, make sure the eddy current brake disc isn't warped or damaged. It must be perfectly flat to do its job properly.
    will do. cheers
    "lack of passion is fatal"

    Vinyl: Garrard 401, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GTE /Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Miyajima Zero B 0.7mil mono / Vintage GE VRII mono / Amps: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture sapele rack

  6. #6
    Join Date: Jun 2010

    Location: Devon

    Posts: 322
    I'm Matt.

    Default

    Is the pulley aligned correctly - With the platter removed get down the eye lever with the running face of the idler wheel with the unit on. Does the idler wheel contact centrally on each step of the pulley or is it fouling the step above?

    With the platter removed spin the idler wheel, does is spin freely or does it stop abruptly?

    - It is worth removing the idler wheel, cleaning the bushes and re oiling

    - Outside of general cleaning as mentioned above if the pulsing (Speed fluctuations) continue it may be a motor coil issue
    Beware the lollipop of mediocrity; lick it once and you'll suck forever.
    http://www.facebook.com/AudioGrailGarrard301

  7. #7
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,125
    I'm Adam.

    Default

    Thank you matt I'll check it out
    "lack of passion is fatal"

    Vinyl: Garrard 401, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GTE /Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Miyajima Zero B 0.7mil mono / Vintage GE VRII mono / Amps: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture sapele rack

  8. #8
    Join Date: Mar 2016

    Location: Barnet, london UK

    Posts: 1,125
    I'm Adam.

    Default

    Matt definitely the pulley adjustment... rock solid now! Thank you
    "lack of passion is fatal"

    Vinyl: Garrard 401, Russ Collinson 'shindo style' plinth / Tenuto gun metal mat / SME-3012 j7 rewired / audio-technica ATP-12T - phonomac modified / Ortofon Vintage SPU GTE /Shure M3D / Ortofon Royal N / Cartridge Man Music Master with isolator / Miyajima Zero B 0.7mil mono / Vintage GE VRII mono / Amps: Radford STA25 mk3 / David Coe AD Audio 'Satchmo' pre & phono / Hashimoto HM-7 SUT / Digital: SW1X Audio Design DAC 1 signature / Roon / Tidal Speakers: Tannoy 12" MGs' in RFC custom 'Rutland' Cabinets with RFC custom crossovers / Cables: Duelund DCA16GA tinned copper / Kimber 12TC / SW1X Audio Design USB-SPdif / Duelund DCA20GA interconnects / SW1X Audio SPDIF Aero 6 / Mains Power Conditioner / Box Furniture sapele rack

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