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Thread: Turntable Speed

  1. #1
    Join Date: Jan 2019

    Location: Cambridgeshire, United Kingdom

    Posts: 279
    I'm Russell.

    Default Turntable Speed

    I recently got a lovely Ariston RD80 and spent a bit of time at the weekend getting it set up correctly.

    I’ve added my RB250 arm and an Ortofon 2M Red and have to say I really like the sound it’s giving me, however, it is running ever so slightly slow (Turntabulator App saying 0.7% at 33.1rpm).

    I’ve added new oil to the bearing, lubed the motor with a couple of drops of oil as well as getting a new belt but it’s still at 33.1rpm.

    Should this concern me or is it within an acceptable tolerance (app says it’s “Ideal”)? I also have a Technics SL1200 which as you would expect bang on the money with its speed as well as an RP3 and we all know Rega’s run a little fast so maybe it’s being used to these TT’s which is making the Ariston sound perhaps slower than it actually is?

    Would a change of motor be worth while on such an old deck (even if I could find one) or even an upgrade?

  2. #2
    Join Date: Nov 2008

    Location: Valley of the Hazels

    Posts: 8,974
    I'm AMusicFanNotAnAudiophile.

    Default

    Use the pots to adjust the speed.
    You should find them either side of of the 33/off/45 switch.
    Owner's manual is on Vinyl Engine.
    Chris



    Common sense isn't anymore!

  3. #3
    Join Date: Jan 2019

    Location: Cambridgeshire, United Kingdom

    Posts: 279
    I'm Russell.

    Default

    Quote Originally Posted by Stratmangler View Post
    Use the pots to adjust the speed.
    You should find them either side of of the 33/off/45 switch.
    Owner's manual is on Vinyl Engine.
    Thanks but I have the RD80, not the RD11. It doesnít have that function


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date: Jul 2009

    Location: Hampshire, UK

    Posts: 2,862
    I'm Buriedunderaloadofturntables.

    Default

    0.7% is not an acceptable variance in my book. Sadly, the RD80 has a synchronous AC motor that is frequency locked and has no adjustment. The only tweak you can give it is with different belt tightnesses and thicknesses which will make a small difference, but itís a bit hit and miss.

    I had a Logic DM101 a few years back that I really liked but I got rid of it in the end as the fact that it ran slightly slow got to me in the end. I blame those damn Quartz Locked direct drives and their irritatingly precise speed stability!
    Adam.

  5. #5
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 61,661
    I'm Grant.

    Default

    What's 0.7% in turns?
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
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  6. #6
    Join Date: May 2016

    Location: Gloucestershire

    Posts: 605
    I'm Ian.

    Default

    Have you tried the app on your Technics deck? I don't know this particular app but some are not known for their accuracy.

  7. #7
    Join Date: May 2013

    Location: Rotherham

    Posts: 450
    I'm steve.

    Default

    Speed apps on phones are not very consistent, far better to download and print out a strobe disc and then use a 50hz strobe app, True Note is the one I use and its results are consistent and showed up the inaccuracies of the RPM speed app Iíd been using previously.


    Sent from my iPhone using Tapatalk

  8. #8
    Join Date: Jan 2019

    Location: Cambridgeshire, United Kingdom

    Posts: 279
    I'm Russell.

    Default

    Thanks all for the replies. In my search to 'fix' this alleged issue, I fear I have done more harm than good!

    I now cannot stop the motor pulley slipping all the way down to the bottom of the spindle which in turn now stops the belt staying on the platter.

    Moral to be learned me thinks -* leave well alone in future!

  9. #9
    Join Date: Jul 2009

    Location: Hampshire, UK

    Posts: 2,862
    I'm Buriedunderaloadofturntables.

    Default

    Sorry, just noticed you said this slowness was measured with an app. As most of these are about as much use as a one-legged man in an arse-kicking contest, I'd try it again with a proper strobe disc and a fixed frequency light source (or an oscilloscope and a test record...) before panicking.

    Once you've fixed it, of course...
    Adam.

  10. #10
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,952
    I'm AnDreW.

    Default

    I'll come back to this tonight. I may have some tips.
    SS

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