Mober Maxon DC Motor upgrade Linn LP12 CPU speed control ultra high precision

Description

Beginning of 2015. I saw a review saying that the turntable upgrade from AC Motor to  DC motor sounds like an upgrade from CD to vinyl. So I determined to test it myself.
Why DC motor?
Normally, AC motor is operating at AC voltage 85 -100V AC. AC motor vibrating significantly whenever power is applied because of the higher power, you can feel the vibration with your finger touching the motor or its vicinity. That vibration transfer through the belt to the platter, it ended
up to be picked up by your ultra-high sensitivity cartridge. And therefore, a DC motor operating at only a few DC V, especially a high-quality precision motor from Maxon Switzerland. When it runs, you do not feel anything by holding it in your hand or you don't know it is running or not.
Why Tachometer Speed Control?
It has been known that DC motor performs superior to 100 V AC motor. The question is how to control the speed, low voltage DC motor is very sensitive to voltage, only a few mV could affect the speed. So some claimed DC motor PSU excel AC motor, but the speed varies every second with influence by stylus force and records weight....etc, i.e records 120 g, 180g, 200g...etc. There is only a handful of DC motor turntable with computerized tachometer control. but they are the very expensive turntable. Mober used a photoelectronic tachometer, it reads 16 markers every rpm to calculate and correct speed, it is 500 times every minute and measurement down to microsecond and adjustment in mV level.
Why are 16 markers better than one marker?
In case tachometer reading one marker every RPM at 33.3 rpm, each rpm Needs around 1.8 seconds, usually, it would take several RPM to do the correction. And therefore, it takes many seconds to correct it. If it keeps adjusting every 1.8 seconds. Is it audible?
So far, I had shipped to 24 Countries and Cities , United Kingdom, USA, South Korea, Singapore,  Canada, Australia, Hong Kong, Brazil, Sweden, United Arab Emirates,
Japan, Malaysia, Russia, Thailand, Germany , Norway , Brunei ,Indonesia , Netherland , France , Italy , Taiwan , South Africa and China ( the sequence is according to the timeline of shipment since the first Mober shipped out).
I see comments on the DC motor for LP12 from a rival selling his  third party AC  PSU for Linn LP12  , the statement claims the DC motor is noise than Premotec AC motor. Obviously , it is the school book of “ conflict of interests” and does not fit our common sense.
The same rival had given the best sound of the show in London Stylus Audio show 2016 from a Hi Fi
Reviewer
using My Mober DC motor control in his exhibition room. What a contradictory.
Not sure it refer to the high quality Maxon DC motor or cheap DC motor for toy car ? The same Maxon DC motor being used in the Mars rover, according to some goggle search on the internet.
All knows the AC 24 poles synchronous Motor spinning, that 24 poles chases around the poles by 50Hz, it is like a step motor, not perfect circle, only DC motor core is driven the  magnetic flux, the whole core is spinning, it is perfect circle. Not that difficult to understand.
If you have a LP12 with AC motor, you can feel the vicinity is shaking, that is the result of the poles chasing around inside. All knows DC motor will easily out perform the AC motor, many years ago, a lot of DC motor launch in the market prior to Linn DC motor. All knows with Mober DC motor control, that High quality DC motor is build in an enclosure with build in material to absorb even very little  shaking. With Mober DC motor control, you can't detect any vibration with any equipment, unless you want to say it with hidden agenda?
What is included:
1. Mober CPU and PSU (220/117 V AC) control unit.
2. Maxon DC motor with carbon fiber and aluminum enclosure.
3. Tachometer easy to fit your LP12 top plate.
4. Cable from Enclosure to the turntable (120cm).
5. 16 marker template (self-adhesive).
6, Metal 'M' Logo to fill up the square hole.
7. Step by step instruction with photograph to do the installation.
Mober enclosure dimension:
W29 cm X D8 cm X L19.5cm
Additional features :
1.
LCD display of real-time RPM in 0.1 rpm resolution.
2.
LCD shut down after speed is being stabilized at 33.3 or 45 rpm for 1 minute.
3.
Adjustable rpm  for both 33.3 and 45 rpm in 0.1 rpm resolution.
Note: Both dark silver and black enclosure are available. The standard shipment is Dark Silver, if you want the black enclosure, please leave me a message. I will ship the black enclosure to you.
Please take a look at the Video, the noise in the background is from air-conditioner, not from DC motor.
View more great items
TAS audiophile LP flamenco fever
Video will open in a new window
Using the iPhone app? Copy this link into Safari:
Mober DC Motor for LP12 33.3 / 45 speed selection
Video will open in a new window
[FlipperToolsVideo]