Shure STEREO DYNETIC V-15 User manual

QUALITY ASSURANCE CERTIFICATE
SHURE V-15 SERIES OF STEREO 15°
DYNETIC HIGH FIDELITY CARTRIDGES
The V-15 Stereo 15° Dynetic Cartridge has been
manufactured under the Shure Master Quality
Control Program. This program embraces the
stringent safeguards and standards required by
your V-15 to assure you that it is in perfect
operating condition.
Shure quality control not only covers incoming
parts and the finished product, but intermediate
sub-assemblies as well. For example: every in-
dividual cartridge and every Stylus-Magnet As-
sembly is tested and microscopically examined.
Each finished cartridge is again tested electric-
ally, mechanically and acoustically against qual-
ity and tolerance specifications seldom achieved
in the High Fidelity industry.
Manufactured under U.S. Patents 3,055,988,
3,077,521, and 3,077,522. Other patents pending.
SHURE BROTHERS, INC.
222 Hartrey
Avenue, Evanston, Illinois, U.S.A.
World standard wherever sound quality is paramount
27A268
Printed in U.S. A.
s H U R E
V-15
STEREO DYNETIC®
HIGH FIDELITY
PHONO CARTRIDGE

THE SOUND FROM THE NEW
SHURE V-15 STEREO DYNETIC® CARTRIDGE
WITH ITS REVOLUTIONARY
Bl-RADIAL ELLIPTICAL STYLUS
HAS NEVER BEFORE BEEN HEARD OUTSIDE
AUDIO LABORATORIES
The sound from the new Shure V-15
Stereo Dynetic Cartridge is unique. The unit incorporates
highly disciplined refinements in design
and
manufacture It re-creates music
with a transcendent purity that results in a deeply
rewarding experience for the critical ear.
THE Bl•RADIAL ELLIPTICAL STYLUS
The outstanding characteristic is that the V-15's Stylus has two
different radii ... hence the designation Bi-Radial. One is a
broad frontal plane radius
of 17.8 microns (.0007 inch); while the
actual contact radii on each side
of the stylus are an incredibly
fine 5 microns
(.0002 inch). It would be impossible to reduce the
contact radius
of a conventional spherical/conical stylus to this
micro-miniature dimension without subjecting the entire stylus
to "bottoming" in the record grooves.
The Shure Bi-Radial elliptical stylus, because
of its larger frontal
radius
of 17 .8 microns (.0007 inch), cannot bottom ... and as
you know, bottoming reproduces the crackling noise of the grit
and static dust that in practice cannot be eliminated from the
canyons
of record grooves.
SMALL
RADIUS
5MICRONS
(.0002'')

TRACING The prim e obje ctiv e in fa it hful so und re cr ea tion
is to h ave the pl ay back stylus m ove
DISTORTION in exac tl y the same way as the we d ge -
MINIMIZED shap ed cu t ting stylus moved w he n it pro-
du ce d the maste r r ecor d. This can't be
acco mp li shed with a s pheri cal /c oni cal slylus b ec au se the point s
of
ta n ge ncy (or po int s of co nt ac t be tw ee n th e r eco rd gr oo ves
a
nd the stylus) are constantly c han ging. This e ff ec t manif es ts
it
se lf as tracing dis tortion (s ometime s called "inner groove dis-
tortion") . No te in the illustratio n h ow the po int s of tang ency
Cutter
Conical
(arrows) of the Bi-Radia l
elliptica l
st ylus remain rela-
ti vely c on s tant b ec au se of
the ve ry sma ll 5 mi cro n
(.0002 in ch) s id e cont ac t
radii.
T
he S hu re Bi -Radial Stylus
vas tl y re du ce s a n o th e r
problem in pla y ba ck known
as the " pinch effect." As
ex pe ri e n ce d a udiophil es
know , th e re cor d gr ooves are wide r w he rever an d whenever th e
fl a t, chisel-faced cutting slylus cha ng es direct ions (which is 440
cy cles per seco nd at a p ure middle " A" tone-up to 20,000
cy cles per seco nd in some of the hig h o vertones). An o rdinar y
s
pherical/conical stylus riding the uppe r po rtion of the g roove
wa lls tends to drop w here t he g roove ge ts w ider, and to rise as
the groove nar rows. Sinc e ste reo sty li a nd car tridges have both
ve rtical a nd horizontal fu nctions, this un fortunate a nd unwanted
up-a nd-down mo tion c reate s a second harmonic distortion.
However, s ince the S hure Bi- Radial e lliptical stylus has a broad
f ront face wit h a f1ontal p lane radius o f 17.8 microns (.0007 inch),
an d it meas ure s 25.4 microns (.0010 inch) acro ss at the poi nt of
co ntact with the groove , the sma ll side o r contact radi i are only
5
micron, (.0002 inc h). This confo rms to t he co nfigu1ation of t he
cu tting sty lus a nd hence is not as sub ject to the up-and-down
vagar ies of t he so-ca lled " pinch-effect. "
SYMMETRY, TOLERANCES AND
POSITIONING ARE ULTRA-CRITICAL
Frankly , a Bi-Radial elliptical stylus, however desirable, is almost
impossibly difficult to make CORRECTLY. Diamond , as you know ,
is th e hardest material ... with a rating of 10 on the Mohs
3

STYLUS
4
har dn ess scale. It 's o ne thing to make a simple dia mond co n e,
al toget he r an ot her to make a p erfec t ly symmetrical Bi-Rad ia l
sty
lu s with sufficiently close tol erances, act ua ll y within o ne ten
thousa
ndth s of an inch! Shure has d eve loped unpr ece de nted con-
trol s, in spect ions and manu fact urin g tec hniqu es to assure preci se
posit i on ing, co n fig uration, dim ensions a nd to lerances of the
diamond tip. It is a s
in gular and exacting pr oce dur e ... uniqu e
in the hi gh fidel ity cart ri dge in dustry. And, unless th ese in spec-
tion tech
niques and safegu a rd s are used, an im pe rfectly formed
e
lli ptic co n fig ur at ion can result and literal ly do more harm th an
goo d to bo th r eco rd and sound.
CARTRIDGE
RECORD SURFACE
THE V-15 IS A
15° CARTRIDGE
Th e 15° effec ti ve tracking
angle has r
ece ntly been
the subj ect of sev eral
Sh
ure commu ni cations to
the audiophile . It conforms to the effective record cutting angle
of 15° proposed by the RIAA and EIA and now used by the major
record producing compani es and thereby minimizes tracking
distortion .
The major features , then, of the V-15 are Shure's Bl-Radial
Elliptical tylus,
the singular quality control techniques and
standards devised to produce perfection of stylus symmetry, and
the 15° tracking angle . They combine to reduce IM and harmonic
distortion lo a dramatic new low . In fact
1
the · distortion (at
normal record playing velocities) is lowe r than the inher . ent noise
lev. el of the finest test records and laboratory measurement in-
struments! In extensive listening tests , the V-15 proved most
impressive in its "track-ability '' It co ns is tently proved capable
of tracking the most difficult, heavily modulated passages at a
minimum force of 3/4 grams (in the Shure-SME tone arm). The
enti re V-15 is hand - crafted and subject to quality control and
Inspection measures that result in space - age rellability. Precision Precision
machined aluminum and a special ultra-stable plastic stylus grip.
Exact alignment is assured in every inte rnal detail-and in mount -
ing.
Mu-metal hum shie ld surrounds the sensitive coils. Gold
plated terminals . Individually packaged in walnut box. T he V-15
is a patented moving- magnet device-a connoisseur 's cartridge
in every detail.
5

6
SHURE V-15 DIMENSIONAL DRAWING
SHURE
600
(15.2mm)
MOUNTING
The V- 15 Dynetic Cartridge has s tandard 1/2" (12.7 mm) mount-
ing ce nters (See drawing). Hardware is supplied with each car-
tridge for mounting purposes , In so me tone arms and plug - in
shells, the cartridge sits so deep that the stylus cannot be con -
ve
niently replaced. For these applications, spacers are provided
to insure adequate clearance for stylus removal
SHURE-SME MOUNTING:
To mount the V-15 in the Shure-SME or the SME Precision Pickup
Arm, Model 3009 and 3012, refer to the paragraphs on Cartridge
Ins tallation and Balancing in the Instruction Manual supplied
with the pickup arms.
GARRARD LAB 80 AND A70 MOUNTING:
The Garrard Lab 80 and A70 Pickup He ad Shells have special
Briti sh threads. In order to mount the Shure V-15 Cartridge , use
the two special brass screws supplied with the cartridge.
NOTE:
If hum is experienced when ca rtridge is installed in a metai
h ea d, re moval of the ground tab from the right ground terminal
will probably correct the condition. (See illustration under
CO NNECTIONS, page 8.)