Shure ML140HE User manual
SPECIFICATIONS
Frequency Response
20 to 22,000 Hz
Output (at
1,000
Hz)
4.0 rnV per channel at 5 cmlsec peak recorded
velocity
Inductance
360 rnH
Dc Resistance
1,000 ohms
Optimum Load
47,000 ohms, 200 to 300 pF, includingtone arm wir-
ing and amplifier input circuitry
Channel Separation (minimum)
25 dB at 1 kHz, 15 dB at 10 kHz
Channel Balance
Within 2 dB
Tracking Force
Force at Stylus Total Tone Arm
Tip Setting
Optimum 1.0 gram 1.5 grams
Maximum 1.25 grams
1.75
grams
Force Exerted by Dynamic Stabilizer
0.5 grams
Typical Trackability (at 1 gram, in cmlsec peak
velocity) 400 Hz
-
29 cmlsec
1,000 Hz
-
42 cmlsec
5,000 Hz
-
60 cmlsec
10,000 Hz
-
50 cmlsec
Net Weight
4.5 grams
Replacement Stylus
NIIOHE, nude MASARTM-polishedhyperelliptical
diamond tip, 5
x
3Bp (.0002 x ,0015 in.),
MICROWALUBeTMberyllium shank
2
BIFOLD-PARAFLUX Coil Core
Interlocking
The
cartridge body
of the
ML140HE
contains
an abundance of new functional electrical
featuresfor highoutput with maximumfidelity.
a
The BIFOLD-PARAFLUX coil-core has
prealigned two-layer folded pole pieces
with parallel flux laminations to provide
greater efficiency of energy transfer and
maximumchannel separation. The result is
superb stereo imaging and depth.
w
The architecture of the internal frame in-
terlocks to produce a completely rigid,
nonresonant substructure. The cartridge
body will never wear out or cause deteriora-
tion of the sound.
a
The true humbucking coil configuration
results in maximum hum cancellation.
a
The noncorroding gold-plated terminal pins
ensure continuity of the signal path.
The Dynamic Stabilizer has been newly design-
ed to maintain the traditionally distinguished
Shure effectiveness in overcoming real-world
warp, static, and dust obstructions to record-
playing accuracy.
w
The Stabilizer's viscous-damping reduces
warp and tone arm resonance effects to in-
significance. The newly designed miniature
pivot system acts like a shock absorber to
prevent groove skipping, mistracking, and
distortion caused by record warps.
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ML140HE
The electrically conductive Stabilizer fibers
remove static charges from the record sur-
face and conduct them to ground to
eliminate static charge noise and minimize
the attraction of dust tothe record surface.
More than
10,000
tiny fibers in each
Stabilizer reach down into the groove to
sweep away interfering and abrasive dust
and grit. Records stay cleaner and noise
free longer.
Functioning like a shock absorber, the
Stabilizer protects the stylus from damage
if it isaccidentally dropped on the record.
The unique Shure
SIDE-GUARD
protects the
stylus from accidental damage caused by im-
pacts from the side, such as when the tone
arm slides across the record.
The elements
of
the stylus
have been
meticulously optimized for low effective mass,
continuity of groove contact, and accurate
duplication of intricate groove modulations.
The result is a cartridge with excellent sound
clarity that enhances the enjoyment of listen-
ing to records. Three features of the design
provide this exceptional performance.
m
The ultra-thin wall beryllium shank
com-
bines an ideal configuration with an ideal
material. Beryllium is extremely light, yet
highly rigid. Shure has developed a unique
fabrication method, called MICRO-
WALLIBeTM,that forms the shank into a
thin-wall tube of 13p-thick
(.0005
inches)
beryllium. This yields the highest ratio of
stiffness to density of various attainable
shank materials and configurations. We
call this ratio the Shank Performance Ratio
(SPR); higher numbers mean improved per-
formance, especially in high-frequency
trackability. To the listener it means that
the onset of complex difficult-to-play
sounds, such as trumpets, pianos, female
vocalists, and full orchestras, will sound
truer and will be cleanly reproduced.
Below are shown various possible beryllium
shank structures, and the SPR of each.
MlCROWALLlBe is clearly superior.
BERYLLIUM SHANKS:
SHANK PERFORMANCE RATIOS
Solid Rod:
Thick
Wall Tube: MICROWALLIBeTM
10
mil dla.
2
mll wall;
0.5
mil wall;
12 m~ldia.
18
mil d~a.
1.00 SPR* 2.06 SPR* 6.25 SPR'
'SPR: Stiffnessldenslty relative to
10
mll diameter solid
rod
w
The hyperelliptical tip geometry has an op-
timized tip-groove contact area that
dramatically reduces both harmonic and in-
terrnodulation distortion. The result is
crisp, precise sound throughout the entire
record.
ELLIPTICAL HYPERELLIPTICAL
TIP SHAPES
rmn
2nd harmonic dlstortlon, average both channels
3.7
kHz, 31 cmlsec peak recorded veloclty
99%
IM
dlsiortlon, average both channels
1 kHzll.5
kHz,
15 cmlsec peak recorded velocity
6mll 2xim81 Zx15m11
Sphei8cai
Elllplical Hy~erell8~f8cal
The ~?i~~~~~-~olishedcontact areas
of the
tip decrease groove abrasion. Records last
longer and stay quieter.
NOISE BAND WIDTH: 500Hz
TO
20
kHz
MEDIUM: LACQUER MASTER
LACQUER GROUP
1
PLAYED
BY
UNWORN
CONVENTIONAL
STYLUS
7
LACQUER GROUP
2
PLAYED
BY
UNWORN
MESAR
STYLUS
1234567891011
NUMBER OF PLAYS
FREQUENCY RESPONSE, TRACKABILITY,
AND HIGH FIDELITY
Performance is the ultimate test of success
for any cartridge design.
Frequency response
and
trackability
specifications are two of the
most important indicators of successful high-
fidelity performance.
Frequency response
demonstrates the ac-
curacy of reproduction of tones across the en-
tire audible spectrum.
A
flat frequency
response displays a cartridge's ability to
reproduce
all
sounds without emphasis or at-
tenuation. The tonal balance of low, mid, and
high pitchedsounds are reproduced exactly as
they were recorded.
Trackability
measures the ability of a stylus,
at a given tracking force, to maintain contact
with both groove walls while negotiating the
tortuouspeaks, valleys, andhairpinturns of to-
day's heavily modulated record groove.
A
car-
tridge must allow the stylus tip to stay in firm
contact with the groove walls to produce clear,
clean, undistorted sound, and to prevent
record groove damage that permanently alters
and distorts the sound.
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