Kuzma Stabi M

Vienna

VIP/Donor
Oct 14, 2018
405
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Very interesting. Have you tried the Platis or heard it in use?

If I recall correctly, Franc previousl offered an active isolation platform. It was someone else's manufactory. The Platis is passive - I'm guessing it is a Kuzma design.
hi Tim,
No I haven’t tried it personally but having spoken with Franc, he is suggesting it with confidence.
 
Dec 17, 2015
334
49
213
Moscow
Guys, if you have RPM app on your phones or Analog Magic, please, measure wow/flutter on your Stabi M TTs. I’ve done some measurements with RPM and got 0.3 on 33 and 0.1 on 45. 0.3 is a lot! Is it normal for Kuzma TTs?
 

bonzo75

Member Sponsor
Feb 26, 2014
14,412
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London
Guys, if you have RPM app on your phones or Analog Magic, please, measure wow/flutter on your Stabi M TTs. I’ve done some measurements with RPM and got 0.3 on 33 and 0.1 on 45. 0.3 is a lot! Is it normal for Kuzma TTs?
That's interesting as Vienna posted his Brinkmann balance wow at 0.06 for 33 (I believe it is 0.04 for 45)
 

bazelio

Well-Known Member
Sep 27, 2016
1,377
647
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California
Guys, if you have RPM app on your phones or Analog Magic, please, measure wow/flutter on your Stabi M TTs. I’ve done some measurements with RPM and got 0.3 on 33 and 0.1 on 45. 0.3 is a lot! Is it normal for Kuzma TTs?
No, it's not normal. I measured 0.075% on 33 RPM when I got the Stabi M years ago. I've never replaced the belt and measure about 0.085% now.
 
Likes: abeidrov
Dec 17, 2015
334
49
213
Moscow
No, it's not normal. I measured 0.075% on 33 RPM when I got the Stabi M years ago. I've never replaced the belt and measure about 0.085% now.
Thank you, Bazelio. This is good to know. I understand you use Analog Magic. Can you do the same measurement with the RPM app on your phone? I wonder if it gives a reliable measurement.
 
Oct 14, 2018
405
287
145
44
Guys, if you have RPM app on your phones or Analog Magic, please, measure wow/flutter on your Stabi M TTs. I’ve done some measurements with RPM and got 0.3 on 33 and 0.1 on 45. 0.3 is a lot! Is it normal for Kuzma TTs?
from my limited experience such excessive wow numbers are associated with:

1. Contaminated belts- check with the manufacturer for the best cleaning method
2. Lack of bearing lubrication- check inverted bearing’s oil level (in the shallow well at the top)
3. insufficient belt tensioning- ensure clean -oil free- hands while you will be handling the belt.
4. Contaminated motor pulley or sub platter
5. Aged belt
6. If the above are ok you will have to check your motor and or speed controller
7. Worn bearing

is you tt using an AC synchronous, DC or BLDC motor? Also do you notice excessive speed variations too?

p.s. I assume that your tt is perfectly leveled, otherwise this is a serious factor for increased resistance thus speed inconsistency
 
Dec 17, 2015
334
49
213
Moscow
It has a DC motor. Thanks for the advice. I will check all the things you mentioned.
 

Calle_jr

Well-Known Member
May 24, 2015
158
7
105
Sweden
www.euphonia-audioforum.se
Guys, if you have RPM app on your phones or Analog Magic, please, measure wow/flutter on your Stabi M TTs. I’ve done some measurements with RPM and got 0.3 on 33 and 0.1 on 45. 0.3 is a lot! Is it normal for Kuzma TTs?
I'm more suspicious to the phone, and to that app in general.
I understand it measures the speed and calculates the deviation from 33 1/3 rpm, right?
That's not wow or flutter. It's just a speed deviation which can be adjusted on the motor control of Stabi M.

We are not that sensitive to speed deviations. E.g. most people can't separate even between 990, 1000 and 1010 Hz. It varies with frequency, we are more sensitive to LF and less to HF.
But we are very sensitive to speed change, i.e. acceleration.
I think the speed change should be limited to less than +/-0.1% on a TT.

Does the app give some more speed measurements? Can you make a screendump?
 

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