well tempered classic spinning speed issue

have my well tampered classic turntable and arm , square motor from the nineties , upgraded to black platter and arm.
recently it started noticeable unstable and slower speed .
it's like this for awhile.
ordered and changed to a new belt . not sure if it helped, maybe a bit, but after some time it went back to same problem.
can't know if the issue comes from the belt, or the motor, or other reason.
read in some places about doing something to the motor spindle, but didn't understand it.
other suggestion was to lubricate motor bearings , which i don't know where th y are.
will appreciate any suggestion .

 

Is the belt one of the thin skinny ones?
I kept having that problem with them slipping until I went to a thicker, wider one.
Johnny Winter sounded like he weighed 400 pounds.
I think I went with this fellow years ago:
Turntable Belt for Well Tempered Labs CLASSIC REFERENCE RECORD PLAYER 35.1 | eBay

 

it's same dimensions that the original one.
when you say "thicker, wider one" do you mean both of those dimensions have bigger value?
do you own WT classic?
how do you test the spinning speed.
when i'm using the android app by putting my phone on the plater there is some place the the plater bends down, so u can't be sure about it.
today i received between 32.28 to 33.80 average 33.12
wow 1.9 %
i think that the high wow is because the bending of the platter

 

when you say "thicker, wider one" do you mean both of those dimensions have bigger value?
Yes.
do you own WT classic?
Yes and a square motor as well
how do you test the spinning speed.
Ears, I have pretty good pitch.

Over on the Well Tempered Forum on audiocircle they made a production about how you should only use the same size belt as there will be sonic degredation otherwise. I'll stick for a belt that's going to last more than 6 months.

 

thanks.
can you point to the specific belt you are talking about, or all of those on the ling you gave me are those ?

 

That link is who I bought them from quite a few years ago.
I went through the $45 stock ones like crazy before I gave up and ordered stouter ones.
Haven't had any speed problems since.

 

I’d say it’s the motor having issues and is likely showing it’s going to give out soon. See if you can hunt down the correct part if your willing/able to replace it. You already bought a belt, so unless it’s bad, troubleshoot the next thing. Other areas to check would be the actual motor, look for any gunk, dirt, oil, grease, lint/string buildup etc and clean it off. Test the motor by running it through a battery and see if you feel or hear any inconsistencies with it running. If the motor can’t be cleaned or any obvious defects found, I’d replace it.

 

my question was how can i be sure which one is "stouter ones"
is there any model name or a spec for it that i can check before ordering?

 

i don't see any of those.
someone suggested me to do some lubrication to the motor bearings, but i dont know how to get to it.
what do you mean by "running it through a battery"?
to replace the motor i have to be sure that this is the issue.
above it i'm not sure you can get one on the market.

p.s
i bought the new belt from an amazon seller.
who knows if its a genuine one?

 

The belt is slipping which is causing his problem.

I already posted a link for where you can get it but here it is again:
Turntable Belt for Well Tempered Labs CLASSIC REFERENCE RECORD PLAYER 35.1 | eBay

 

I'd check to make sure the pulley on the motor shaft (spindle) is secure and not moving. I also wouldn't trust a phone app unless the phone was previously tested/calibrated with a table known to be accurate, my Samsung phone is very inaccurate. You can count the platter revolutions for 3 minutes at 33.3 RPM, should be exactly 100, or use a strobe disc for your power line frequency and a light source.

 

i wasn't sure if all of those in the link are the thicker, wider ones , or there are also the thinner.

 

the pully goes up when you pull it, i think it's suppose to be like that since it was like that from the beginning and the screw on top of it that hold it is completely tightened .
as for the spinning speed i can tell by my ears that there is an issue.
i have the strobe disc, tried it and it was not so easy to determine.
i'll try the "3 minutes at 33.3 RPM, should be exactly 100"
very good idea.

 

there is no option to attach an photo?

 

This site doesn't host images, you can only link to an image stored somewhere else that also allows sharing, like on imgur.

 

unfortunately this seller does not ship to my area

 

Remove the pulley from the motor shaft, then reinstall and tighten its set screw. If that is not doing it, then try a different belt as @SteveFord says.
-Bill

 

i'll try it

 

The belt width and thickness can affect the speed, but it wouldn't be a gross speed error. The most likely problem is belt slippage, and/or oil somehow found its way on the belt. Try cleaning the belt and motor pulley.. and the platter with naptha. (lighter fluid or charcoal lighter for the BBQ) It is safe to use indoors but do have a window open!

 

i ordered a new belt.
will see if it's help.
if not , i'll go to further steps

 

i received today the new ticker belt.
checked how many revolutions' it makes in 3.00 minutes.
the old tinier belt makes around 99.3 revolutions'.
and the new one around 100.
i hope i am wrong but i think that i still hear some not stable sound speed.
can be that the revolutions counting is right but something is still un stable?
i'll check it again on some old basic turntable i have

 

You put a twist in the belt, right?
The Classic doesn't allow much room to move the motor (unlike the original square motor one).
If it's not running true and it's not the voltage and it's not worn little nubbins from no oil in the spindle cup and it's not an oily platter section where the belt rides than it's your motor.
Get one of those strobe discs and put a light on it.
Here's an example (you have to click on Watch On YouTube):

 

thanks.
i have a square motor but trying to move it closer or farther from the plater didn't make a big change.
about the voltage, it can be, but i don't have a way to check it.
and i think it's also have to do with the frequency.
there is no oily belt , plater or pully.
i use recently for the spindle cup suing machine oil. no t sure if it's the best one for it.
what is "little nubbins" ?
i have a smaller strobe compare to the one on video, had difficulties to work with.
but i didnt use a light , i'll try again.
hope it's not the motor, not sure i can get one and be sure it's work properly.

 

If you are still hearing wavering on sustained notes, make sure you aren't listening to the effect of an off-center record, you can really only evaluate wow and flutter effects if the record has near perfect centering so that the tonearm isn't swaying back and forth at all, or up and down, for that matter. Unfortunately, many records are slightly off-center and/or warped, and quite a few are way off-center too.

As mentioned above, Firebaugh has been an advocate of belt twisting to lower flutter, but you still shouldn't hear pitch wavering on a decent belt-drive table if playing a well centered and flat record.

 

i know what you mean.
have one or two records like this.
this is not the case.
i try to do some additional checking again and se if it's only in my mind.
as i said I'll compare it with another turntable i have , direct drive