JVC introduces a tonearm that out-thinks warps and resonances.
Ideally, a stylus should operate in a resonance-free environment where it can respond to groove modulations and nothing else.
That, unfortunately, has been a tall order for tonearm designers. Because minimizing one kind of resonance makes the arm susceptible to other kinds.
Low-mass arms are the least susceptible to warp-induced resonances. But they're the most likely to have structural resonances which color the sound of the music.
Higher-mass arms are less likely to have structural resonances. But they may have trouble negotiating warps and large groove modulations, especially with high-compliance cartridges.
JVC engineers have attacked this problem by developing a tonearm that "thinks". Called the Electro-Dynamic tonearm, it causes the stylus to "see" ideal effective mass, even though the arm itself is medium-mass and very rigid.
Whenever a surface warp or eccentricity begins to create abnormal arm movement, two motors provide instant dynamic compensation. So the arm is not "thrown" by forces of inertia, momentum and gravity. The stylus remains properly seated in the groove.
As a result, you hear stunning clarity (because of reduced IM distortion), stable stereo imaging and superb tracking of even the most difficult groove modulations.
As exciting as our E-D system is, you should not overlook the qualities of the turntables that feature it.
The QL-Y5F for example, includes a double-servo quartz system which regulates platter rotation with greater accuracy than single-servo systems. The heavy platter and high-torque, coreless DC direct drive motor sustain a very high moment of inertia, avoiding the transient speed variations that can color sound timbres. Front-panel switches control the up/down and left/right movement of the arm, without the user ever having to touch the arm itself.
If your system can benefit from a turntable of this caliber, you will undoubtedly want to evaluate the QL-Y5F and its E-D tonearm for yourself. Please dial 800-221-7502 for the location of your nearest JVC dealer (in New York State 212-476-8300). 58-75 Queens Midtown Expressway, Maspeth N.Y. 11378. US JVC CORP
(Source: Audio magazine; Feb. 1981)
Also see:
JVC Model QL-7 Direct-Drive Turntable (Equip. Profile, Dec. 1978)
Infinity Black Widow Tonearm (Mar. 1979)
Shure V15 Type V Phono Cartridge (Nov. 1982)
Signet TK10ML moving-magnet phono cartridge (Feb. 1985)
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