What's the speed of your turntable?

Discussion in 'Audio Hardware' started by TVC15, Jul 12, 2015.

  1. redflag

    redflag Forum Resident

    I have that very table and it is spot on speed-wise. Hopefully, it is just the belt. Otherwise I'm not sure what the fix would be. I DID have a hard time when I switched over to a 33/78 pulley because the motor was 50 hertz instead of 60 like I was told it was. So..maybe that could be the issue and you have the wrong pulley. If you're dealing with Bes over there at Music Direct, you're in good hands though.
     
  2. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    I don't think I have the "DC" version.
     
  3. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    Yeah it doesn't have "DC" in the part/model number on my order history, so if the belt doesn't fix the speed, I'll invest in the speed box, which I might do anyway.
     
  4. H8SLKC

    H8SLKC Forum Resident

    Location:
    Boston, MA
    I checked a new Marantz TT-15 and it was dead on 33.3.
     
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  5. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    A lot of these belts will lose their rigidity after a while. In some cases, boiling them for a minute or two restores them to their prior rigidity. Might want to try that.
     
  6. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    Boiling them? I have never heard of that...is that a real thing or are you pulling my leg lol
     
  7. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Not pulling your leg at all. That's what plenty of people do for VPI belts. Not sure if the material for Rega belts is the same but assuming it is, you definitely can do that.

    Might fix your issue entirely or at least minimize it greatly and it's a free fix. Look into it and report back.
     
  8. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    It's not dry and brittle, just stretched a bit.
     
  9. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Just tried measuring the speed of my VPI Prime. Unfortunately, I don't have an iPhone so that Tubular app (or whatever it's called) is off-limits. I have an iPad but for many reasons, that wouldn't work.

    Tried with a strobe but the apps on my Android phone don't seem to ever detect anything conclusive. Tried an RPM measuring app which did work but apparently, the sensors of Android phones vary greatly in accuracy so no idea if my Samsung Note 4 is a good precise measuring tool.

    My motor was almost hugging the plinth as that's what I've seen in videos but also in another, I saw how pulling the motor away reduces the speed. Mine was topping at 33.5 so I pulled the motor until it reached 33.3 for 99% of the turns. The motor is now somewhat far from the turntable and the belt certainly is stretched more than before. Music seems to be sounding more natural to me.
     
  10. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Exactly what boiling would address. Let me know how it goes.
     
  11. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Update.

    Saw a video on YT of a guy with a Prime who brought his belt from the lowest point to its highest and accomplished slowing down the speed with the motor still almost hugging the plinth. Tried it and it accomplishes the same effect as putting the motor away from it and it looks far less silly.
     
  12. Davey

    Davey define a transparent dream

    Location:
    SF Bay Area, USA
    Yea, the pulley is stepped so you can fine-tune the speed.
     
  13. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    After listening more and more, I notice that things still don't sound quite right so I'm wondering about acquiring a speed controller. I started a thread in the Hardware forum. If you have anything to contribute, please let me know.
     
  14. Jack Flannery

    Jack Flannery Forum Resident

    Location:
    Houston, TX
    Mine has an angular velocity of about 700mph or so.
     
  15. Davey

    Davey define a transparent dream

    Location:
    SF Bay Area, USA
    Yea, I saw that, but I don't have anything that wasn't covered in the other thread Spsesq started. Haven't you been listening to it for a few months now? Did it just start not sounding quite right?
     
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  16. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Only after putting a CD on did I notice slight tempo issues. Again, it could be minor to some but I'd like to pinpoint exactly how off I am.
     
  17. Davey

    Davey define a transparent dream

    Location:
    SF Bay Area, USA
    Don't they come with that VPI strobe disc on the platter? The one shown in all their pictures that everyone seems to hate to look at except VPI? That, and an incandescent (old-school type with filament- not LED) or florescent bulb is generally all it takes for most of us (or at least me, I may not be very sensitive to minor speed changes from hour to hour or day to day :)), but my old Thorens does come with a two-phase motor controller, and you can adjust the 33 and 45 RPM frequencies, no feedback, but it's for the more typical in those days 16VAC motor, and fairly low power too.
     
    Last edited: Jun 10, 2017
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  18. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    Okay new belt came in today for my Pro-Ject Debut Carbon (non-DC version), and the speed is still slow (29.9 to 33.0).

    Does anyone know how to make fine-tune adjustments to this TT?

    Thanks.
     
  19. Davey

    Davey define a transparent dream

    Location:
    SF Bay Area, USA
    There's not really any way to adjust the speed electronically unless you have a speed box with adjustable frequency. I think all you have right now is just a transformer to step the voltage down for the motor. You can speed it up with a thicker belt, or slow it down with a thinner one, but not much else you can do mechanically to change the speed on a synchronous motor since it's locked to the power line frequency. Maybe try oil in the bearings, how did it ship, did you add oil to the platter bearing when you installed it, or was it already installed? Does the platter spin freely for awhile when belt is off? You can talc the belt for smoother speed (no sticking at release) but that won't usually change the speed much, if at all.
     
  20. Madness

    Madness Forum Resident

    Location:
    Maryland, USA
    The table arrived with the motor already installed. I don't believe the non-DC debut carbon uses power line frequency to manage the speed. So that to me means there should be some sort of adjustment that can be made to the motor, but I'm not going to remove the motor to look at the underside until I hear back from the manufacturer/authorized service center (answers pending).

    Thanks.
     
  21. Davey

    Davey define a transparent dream

    Location:
    SF Bay Area, USA
    Actually, I was referring to the platter and its bearing. If it doesn't have a DC motor, the speed is based on the power line frequency (unless using an external controller, which regenerates the AC voltage to drive the motor, and often includes digital or analog trimmer for the drive frequency). That's what AC synchronous motor means.
     
  22. Vinyl Addict

    Vinyl Addict Forum Resident

    Location:
    MA
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  23. HBJ

    HBJ Member

    Location:
    Europe
    I just measured my Rega RP8 with Turntabulator and my trusty old iPad Mini 2 (without any protection cover etc.)
    Speed is 33,60 or 0,8% too fast.
    That's with brand new white belts installed.
    Will probably get Rega Neo so I can adjust it.
     
  24. StuJM84

    StuJM84 Forum Resident

    Location:
    Kent, UK
    I spent Monday afternoon last week adjusting the speed of my Clearaudio Concept, which was a tad fast. I probably need to really fine tune it a bit more, but it is a lot closer to 33.3 then it was. Just used a printed strobe disk and a lamp. At least its easy to do it on my table :righton:

    I have an app (RPM Calculator) on my android phone but its incredibly off in its reading, so won't bother with that now
     
  25. Cliff

    Cliff Magic Carpet Man

    Location:
    Northern CA
    I'm amazed there are people who claim they can clearly hear the difference between 33.3 and 33.33 (1/10 of 1%). :yikes:
     

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