catman Posted August 4, 2019 Posted August 4, 2019 (edited) G'day all, is it possible to adjust the speed in some practical way? Regards, Felix. Edited August 7, 2019 by catman Spelling error on thread title.
mloutfie Posted August 4, 2019 Posted August 4, 2019 Easiest is to modify pulley a bit of tape around it. It works as a last resort. 1
YNWaN Posted August 6, 2019 Posted August 6, 2019 On 04/08/2019 at 9:11 AM, catman said: G'day all, is it possible to adjust the speed in some practical way? Regards, Felix. Well, the answer is ‘it depends’. More specifically, it depends if you want it to go faster or slower, what the exact turntable is and by how much you want to adjust it?
Guest Karl Rand Posted August 6, 2019 Posted August 6, 2019 On 04/08/2019 at 6:59 PM, mloutfie said: Easiest is to modify pulley a bit of tape around it. It works as a last resort. No, noon, NO ! Only try that trick if you’re utterly insenitive to pitch and speed variations.
Guest Karl Rand Posted August 6, 2019 Posted August 6, 2019 On 04/08/2019 at 6:11 PM, catman said: G'day all, is it possible to adjust the speed in some practical way? Regards, Felix. The geometry of most belt drive turntables, even those with detatched motors, will only allow a limited range of this kind of ‘adjustment’ until the tension of the belt becomes either too slack or too tight degrading other areas of performance. I’d be trying to discover if what you’re hearing is due to something other than the belt’s placement/tension .
Uglu Posted August 7, 2019 Posted August 7, 2019 In most cases there would be an adjustment pot inside the TT electronics or in the motor itself but it all depends on the TT bran and model the options are endless. If you have no idea you might be able to get a technician to change it but you need to make sure the person knows what is going to do to get the right speed.
oztayls Posted August 7, 2019 Posted August 7, 2019 Yes, if the motor is synchronous, it’s speed is regulated by the frequency of the mains supply. Often, if the pulley is tapered, as on a Linn Sondek or Thorens TD, fine tuning the speed can be done by tilting the motor. On such turntables there are screws to do this, so check the manual to see if it’s possible on yours. If you still cannot get the speed close, check the belt. The length, thickness and width of the belt may not be correct and this will definitely affect speed. A genuine belt makes all the difference. Thakker is the pick of aftermarket belt brands.
catman Posted August 7, 2019 Author Posted August 7, 2019 G'day all, thanks for all comments. My turntable in here is a pretty basic Marantz TT1200CT and I suspect that it is running a few percent fast, and enough to be quite audible. Regards, Felix.
acg Posted August 7, 2019 Posted August 7, 2019 You are pretty handy Felix, I have a motor speed controller kit here (three of them actually) that you might be able to use to get your speed right. I'm not sure if that is the sort of thing you would be after, but it is an option. I will put one or two of them up for sale one day...have ended up buying a table with it all built in.
oztayls Posted August 7, 2019 Posted August 7, 2019 Felix, one thing for you to check is the position of the belt on the pulley. For example it may be riding half on the 45 part and half on the 33 part. If this is the case it’s an easy fix as you only have to readjust the pulley height. There is a small screw on the side of the pulley to do this adjustment if that is the issue. From what you’ve described, this is very likely the problem, assuming you are using the correct width belt.
Uglu Posted August 10, 2019 Posted August 10, 2019 (edited) On 07/08/2019 at 2:25 PM, catman said: G'day all, thanks for all comments. My turntable in here is a pretty basic Marantz TT1200CT and I suspect that it is running a few percent fast, and enough to be quite audible. Regards, Felix. If the belt is too tight or too loose it can affect the speed, it is likely that is the belt is old it has stretched Edited August 10, 2019 by Uglu
oztayls Posted August 10, 2019 Posted August 10, 2019 10 minutes ago, Uglu said: If the belt is too tight or too loose it can affect the speed, it is likely that is the belt is old it has stretched Unlikely, as he's reporting speed is too fast and it's a synchronous motor, so cannot run faster than mains frequency allows. With a belt too tight, the motor binds. If too loose, it slips and runs slower. The problem is most likely belt alignment on the pulley. If partially on the wider "45" part of the pulley, it will run fast. Simple fix to realign belt/pulley.
Sierra Posted August 10, 2019 Posted August 10, 2019 On 07/08/2019 at 2:25 PM, catman said: G'day all, thanks for all comments. My turntable in here is a pretty basic Marantz TT1200CT and I suspect that it is running a few percent fast, and enough to be quite audible. Regards, Felix. Have you actually checked the speed of the TT to see if you have a problem?
andyr Posted August 10, 2019 Posted August 10, 2019 5 minutes ago, Sierra said: Have you actually checked the speed of the TT to see if you have a problem? With respect, Sierra - Felix is not exactly a vinyl newbie! If he hears it as running fast atm (compared to his memory of what it sounded previously) - I would say it is. So he has a valid question (without much hope of a helpful answer, though, IMO. ) Andy 1
Wimbo Posted August 10, 2019 Posted August 10, 2019 Get the next belt size up. So, Larger. How old is the one you are using?
andyr Posted August 10, 2019 Posted August 10, 2019 (edited) 6 minutes ago, Wimbo said: Get the next belt size up. So, larger. Que? Larger will probably fall off the platter! Quote How old is the one you are using? What's that got to do with it, W? An old belt - if anything - is likely to have stretched ... so will be loose. This would drive the platter slower - not faster. Andy Edited August 10, 2019 by andyr
Wimbo Posted August 10, 2019 Posted August 10, 2019 (edited) 3 minutes ago, andyr said: Que? Larger will probably fall off the platter! What's that got to do with it, W? An old belt - if anything - is likely to have stretched ... so will be loose. This would drive the platter slower - not faster. Andy Mr Assumption. Maybe I was wondering if he had just bought a new belt. Edited August 10, 2019 by Wimbo Was gonna be abusive.
andyr Posted August 10, 2019 Posted August 10, 2019 14 minutes ago, Wimbo said: Mr Assumption. Maybe I was wondering if he had just bought a new belt. Aah, true, W - apologies. Andy
wartman Posted August 10, 2019 Posted August 10, 2019 Hi Catman If all the adjustments are correct, and there are no speed potentiometers just try different width belts of the correct length. I start with around 5mm, then slowly make my way down to 3mm. One of them usually works. Only one turntable refused to play at the correct speed, with that one I changed the pulley to a slightly smaller one. Thankfully, I keep a lot of new belts, and have too many donor TTs. I will PM you one other fix, as others may find it a bit sinister. Paul
Recommended Posts