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In Reply to: RE: servo control and "quartz locked" are two different things posted by Lew on September 14, 2020 at 15:46:38
Yeah, the difference between the original and MkII (quartz locked) Technics decks is something like .005% in terms of speed stability.
I seriously doubt I could tell the difference.
Edits: 09/15/20Follow Ups:
The meaning of the seemingly trivial .005% depends upon how you define "speed stability", assuming your data are correct. (Where did you find that?). It seems to me that .005%, in terms of any concept of speed stability, would be very difficult to measure, and almost certainly it would not be audible. On the other hand, I have never compared a pre-servo Technics TT to a servo-controlled version of the same TT.
I could imagine that the quartz referencing improves upon the regularity and accuracy with which speed corrections are made. So, two versions of the same table with vs without servo might differ in some audible way even though they wouldn't measure much differently in terms of some concepts of speed stability (for example, speed over short time intervals vs longer time intervals).
Lew asked:Where did you find that?
Specs for first generation and MkII versions of Technics DD decks are listed at
In this context, speed stability is Wow and Flutter
Well, I guess we can all agree that .005% or 5 parts in 100,000 in wow and flutter is likely to be inaudible, so if the two turntables sound different, it's for another reason, but it could still be a reason related to speed control.
That's just part of the difference. And, you're right, the improved speed stability is probably insignificant. I owned the original SL-120, which is simply the original SL-1200 without a tonearm. I mounted the SME 3009 Series II improved tonearm on my SL-120 and it was definitely a very nice turntable. However, it doesn't compare to my SL-1200 Mk2 from the standpoint of sound quality.
The greatest improvement on the SL-1200 Mk2 is a result of damping the plinth. The original version didn't produce bass with the tightness and clarity of the improved SL-1200 Mk2. I thought my SL-120 with SME 3009 sounded good until I heard a better turntable, my Thorens TD-126 Mk III with SME III tonearm. The Thorens reproduced bass with the authority and clarity that was missing in the SL-120 with SME 3009. The newer SL-1200 Mk2 has that same authority and clarity in the bass as my Thorens TD-126 Mk III. Therefore, I think the SL-1200 Mk2 might represent the most noticeable improvement of the entire SL-1200 line except for possibly the newest ones being manufactured today.
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