Anyone experienced speed issues with Artemis Labs SA-1?


Hi guys.
I was listening for several hours and then out of blue on the last record the speed started slowing down and back and then down again. I had zero issues in my 2 years or so of ownership. Used in an all Artemis lab system.

I used my cell phone to measure (after stopping and removing the record) and it showed around 32 rpm first which then - after a few revolutions_ dropped to 30.
Wondering if anyone had the same issue and figured out the fix.
Thaks
L
sancho22
The issue could be the cell phone app.  It stinks.  Does the music have unstable pitch?  Many have reported "problems" with speed after measuring rpm with the cell phone app. Apparently, a measurement of 32 rpm is not outside of the margin of error of the app.
no it is actually the TT unfortunately.
I use the Eagle/Roadrunner from Phoenix Engineering with one of my other TTs. I know exactly what the difference is on the app and the actual rpm. The app was just to assess the drop in rpm which is about 2.0 change. Extremely audible change and slooooowing down of the music.....
I have an SA-1 and have had one instance of a speed glitch but it was half a year ago and hasn’t recurred. I’ve also had two belts go but the second one was my fault as I’d put the splicing tape on the coated side.
thanks!
It was weird as it happened after a few LPs.
I did not listen since then, but checked the speed with the cell phone app and it did not drop.
I will listen tonight again and see if it will re-occur.
well I was very excited that the low speed disappeared during my next session a day or two later. Then of course after 3 LPs it came back...not sure but perhaps it is the power supply acting up?
The Artemis is a very thoughtful design which uses two pulleys, one to drive the belt and the other to push the belt up against the circumference of the platter so that the belt contacts the platter very nearly on its full circumference.  This is to eliminate belt creep and along with the noncompliant belt, it probably works.  Have you looked closely at the passive pulley?  Is there any friction in it at all, when you turn it by hand?  Could it be hanging up on anything? Likewise, can you check for bearing noise in the motor pulley? If the pulleys are blameless, then I'd think about the motor itself.  I always like to eliminate the easy stuff first.
Thanks!
Will check it and report back.
I hope i don't have a motor issue - it is a rare Swiss motor as I understand it and was developed for the TT. 
I hope not.
Checked the pulleys - no friction. Not sure about the bearing but does not seem to have an issue.
After 6 full records I had no issues whatsoever. Hopefully this was it.
If it comes back again I may do some deeper investigation. 
nope. Issue is back. Time to bring it to a professional...
Did you have any luck with resolving the speed issue? I remember reading that each ps was matched to the motor in the deck, a task that required the use of an oscilloscope if so a plug in replacement is unlikely.
The ps was designed by John Atwood.

 http://www.one-electron.com/designExperience.html

I should have left this thread alone, mine started glitching today, I turned it off after the second time in 10 minutes. 
sorry to hear that.

I think I will take mine in a few weeks time for some check-up...
It seems the upper motor bush has run dry and worn, at least I can feel some play in it. I’ve been in the habit of leaving the deck running all day as the sound improves for the first hour after switch on, sometimes I forgot to turn it off before turning in for the night. This practice has been fine on previous decks with synchronous motors but the DC motor on the Artemis runs a lot faster.
The glue holding the pulley had softened enough that I could ease it off to get a bit of light synthetic oil to run down the shaft. I used a bit of Loctite 648 retainer to stop the pulley slipping, not sure about my choice there but it’s what I had.
The speed was still unstable with the Artemis ps at first but a lab power supply set to around 6.2V gave 33 1/3 rpm on a strobe disc, the current draw was initially near 0.1A but after running a few days this had dropped to 0.02A. With the main bearing nicely warmed up the deck would now run stably on the Artemis ps but the next morning starting afresh I was unstable again for an hour before I gave up. A few days later I started it up again and it settled after a few minutes.

Ideally I’d like to replace the motor and do it myself but the Artemis ps needs matching to the individual motor and I’ve not discovered how to do this, there are two trim pots inside the case so potential to get it really wrong. The lab ps makes the deck sound really ordinary so that’s not an option for running it. I’m resisting the temptation to investigate further, for now.
thanks for letting us know - will help with my tech too.
If you used any motor with a speed adjustment function, then you would not have to worry about matching the motor to the turntable. You would just observe the initial speed error and use the adjuster to correct it. Have you considered adapting the eclipse motor system sold by SOTA to the Artemis? If you are happy with the Eagle/Road Runner, you will be equally happy with the eclipse, since the two emanate from the same inventor.
It often surprises me that belt drive aficionados are willing to put up with so much fuss, to keep their turntables running at correct speed. The whole idea of a belt is a pain in the ass waiting to happen.
Thanks for the suggestions 
just for context I have 8 TT - two are DD, 3 belt and 3 idler ...
Each has its own strengths and signature sound 
The Yamaha GT-2000 is great (full Yammy stack) A’s is the Garrard 401 or 301
the Artemis is part of a full Artemis system and it works well when running correctly- given that the belt is an actual R2R tape with a tensioner it is different from the VPI or Fairchild 755...
Don't get me wrong; I do like the Artemis, as mentioned above.  I hope you will be able to resolve the problem.  And certainly, the other drive systems have their specific pesky issues.
No worries I do appreciate the advice
i do spend a fair amount of tinkering with my Modded Lenco 78 - to your point 

I had zero issues with the Yamaha though 

Let’s hope we can fix this Artemis table as I really love it - not to mention the Schroeder arm on it
After getting a few microlitres of oil into the motor and letting it soak in the deck is running reliably again and sounding its old self. Also the motor noise, which was audible up close from the time I got the deck is now just about inaudible. What I’d put down to the brushed nature of the motor may have been the bearings running dry.
 An oil called “liquid bearing” was recommended but not easy to obtain outside the US so I used a bit of SAE5 synthetic I had handy.

The difference between the Artemis ps and the lab ps was interesting,  With the lab ps set to a fixed voltage and current set to 5Amax (but drawing around 0.03A) making the deck sound very ordinary in comparison to the Artemis supply.
great news - thanks for sharing!