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 many countries, United Kindom, USA, South Korea, Singapore, Canada, Australia, Hong Kong, Brazil, Sweden, United Arab Emirates, Japan, Malaysia, Russia, Thailand, Germany , Norway , Brunei and Indonesia ( the sequence is according to the timeline of shipment since the first Mober shipped out).
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.
