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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: TECHNICS SL-1200 MK2 - Under-appreciated??? posted by kiamyong@singnet.com.sg on October 26, 2003 at 07:06:42:
Add to that list rock-soild stability of the image, the ability to deliver pace and timing of musical events with great accuracy- especially when plowing through huge orchestral crescendos. I believe they are the ideal engineering platform to optimize the performance of low-impedance low-output MC carts.The problems as you mention of some loss of delicacy on the midrange seem common. Perhaps there's a loss of some "sheen" imparted by certain resonance phenomena prevalent in belt drive TT's. Whatever, DD's seem a bit "flat" (in the sense of uninvolving) in the midrange. I say this after experimenting with a variety of tonearms on a number of high quality DD's.
I disagree strongly that the frequency-genertor "hunts." If it did, you wouldn't get the image specificity and excellent "PRAT" you're hearing. That is an old wives' tale. The effect of the servo circuit is to make the platter appear to the motor to have a huge rotational inertia. Much smarter to do that with a circuit than with buckets of toxic lead shot. The torque as it is applied to the platter is actually highly uniform and there is sufficient actual mass rotational inertia to smooth out the fluctuations in the torque, if designed properly. The results speak for themselves.
The principal drawback of DD designs is that they are very expensive and difficult to build at the quality level necessary to make them work well. That's why only the major manufacturers built them in the Golden Age- they could amortize the tooling and setup cost over large numbers of units.
(1) The motors must be specialized, massive, AC-synchronus units driven by frequency-generator supplies. (Numbers of contempporary belt-drive tables have optional outboard f.g. power supplies that are sold for $1000 or more.)
(2) The speed-detection scheme is complex. I prefer the Denon approach to read the edge of the platter, rather than Panasonic/Technics approach using coil in the motor.
(3) The isolation and resistance to airborne sound of the plinth holding all these massive components is a design challenge. It takes a well-designed base to minimize structural transmission, airborne pickup and to handle the resonant energy from the arm/cartridge. Even the better vinage DD tables had pretty lousy bases in stock form. From what I can see, the Technics base is pretty bad. I think a significant improvement could be had by tweeking there.
(4) I'm not certain but I think the design philosophy of current tonearms developed for the mid- to hi-end belt drives that govern the arm market today may be a less than optimum for a high-performance DD. You have to be cautious and experiment with arms a bit. I think another imporvement could be had tweeking the arm of the Technics or replacing it. Anyone here do that?
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Follow Ups
- You just discovered several of the the advantages of Direct Drive 'tables! - mr.bear 12:16:01 10/26/03 (4)
- Re:the Technics base is pretty bad - ffrr 22:11:49 10/26/03 (3)
- Re:the Technics base is pretty bad - mr.bear 20:50:05 10/27/03 (2)
- Re:the Technics base is pretty bad - ffrr 01:53:44 10/28/03 (0)
- Re:the Technics base is pretty bad - hybris 00:27:43 10/28/03 (0)
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