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發表於 2013-4-12 10:23:24
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ma73 發表於 2013-3-30 09:54 
The Logo looks like 47 Lab, their amp is simple, simple is beautiful. Here the turntable is so compl ...
Yes, it is 47Lab Koma, my next target.
Junji Kimura says about the design:
The conventional wisdom to control turntable's vibration/resonance is to damp and/or isolate the resonance by the use of suspensions, damping materials, heavy mass loading, etc. While those techniques are effective in certain ways, it is impossible to fully control the resonance, and it often comes with serious side effects. I'm taking an opposite route. Let the resonance and vibrations run freely between the component and the environment but simplify its route and the mode. That is why the plinth is directly coupled to the main feet. Ideally, it should stand only on this one foot like a rotating tap ('Koma' in Japanese), thus eliminating the twisting force created between the rotating platter and feet placed outside of the dead center of the spindle.
For this method to be most effective, the component should be rigidly coupled to the environment. We recommend a hard/solid platform and a shelf with rigid structure to set Koma on.
As for the effect of the counter rotating platter, imagine a single platter turntable placed on a boat floating on calm water. No matter how we smooth out the friction of the rotation, we can not completely eliminate it, and given enough time, the force created by the rotation would be transmitted to the turntable base, to the boat, then to the water, making the boat rotate with the rotation of the platter and cause ripples on the water surface. The counter rotating platter is to neutralize this force created by the primary platter.
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IP卡
狗仔卡
提升卡
置頂卡
沉默卡
喧囂卡
變色卡
顯身卡
