Shure m 12 owners manual

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SPECIFICATIONS

Sensitivity: Output at 1000 cycles- 14 millivolts i
h for 10 centimeters per second.

Response Frequency Characteristic: From 20 to 20,000
c.p.s. :t 2db (See Fig. C). There is considerable
response down to 10 cycles and up to 30,000 cycles
per second.

STYLUS MI CARTRIDGE

Needle tip material ..................... Diamond
Needle tip radius . . . .0.7 mil (0.018 mm.) :4.- 0.1 mil
Needle tip

compliance ...... 9.0 x 10 centimeters per dyne
Needle tip mass .................. 1.25 milligram
Tracking force ........... l to 2 grams - adjustable

Recommended load Impedance: 10,000 ohms. Higher
values of load impedance will produce a slight increase
in high frequency response. See Fig. C.

Inductance ..................... 130 millihenries
D. C. Resistance ...................... 180 ohms
Dimensions ' Model M16 Model M12
in. : mm. i in. mm.
Overall length .......... ' 14% 374 11%.,1 287
Stylus to center of base . . 11 279 A 8% ' 216
Base diameter .......... k 2 _ 50.8 I 2 50.8
Range of height of ' i i
adjustment ........... 1% 41.3 g 1% I 41.3
Arm pivot to turntable 2 .'
center ............... 101%2' 269 8% 210
Weight M16 .............. 11.1 ounces (315 g.)
Weight M12 .............. 10.6 ounces (300 g.)
Packaged Weight ...... 1 pound, 3 ounces (538 g.)

Replacement Styli:

MI Cartridge-
Shure N1 Stylus .7 mil radius (0.018 mm.)

M2 Cartridge-
Shure N2 Stylus 2.7 mil radius (0.07 mm.)

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PHONO REPQODUCER

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General:

Model M16 Studio Dynetic Reproducer is of the highest
quality, employing a new electromagnetic transducer for
playing lateral phonograph records. It is intended to repro-
duce LP Recordings with needle forces of 1 to 2 grams with
practical elimination of record and needle wear. The Model
M16 Studio Dynetic is intended for studio and professional
use and is capable of reproducing records up to 16 (40
cm.) in diameter. The M12 Studio Dynetic is similar to
the Model M16, but is intended for use with equipment
where space is limited. It is designed to reproduce records
up to 12" (30 cm.) in diameter.

The cartridges in the Studio Dynetic reproducers are of
the plug-in type and can be readily removed and replaced.
The standard cartridge furnished with the Studio Dynetic
reproducers is Model Ml which has a replaceable .7 mil
(0.018 mm.) radius stylus bearing the Model Number N1.
For 78 rpm records and for broadcast use, the M2 car-
tridge is available which has a replaceable 2.7 mil (0.07
mm.) stylus which bears the Model Number N2. The M2
cartridge is rfi gram heavier than the M1 cartridge and it
allows the playing of 78 rpm records with a needle load of
2 to 3 grams.

The needle load in the Studio Dynetic reproducers is
readily adjustable by turning a counter-balance (See Fig.
A) visible from underneath the am. With a high grade
turntable and motorboard free of vibrations, the counter-
balance may be adjusted as far from cartridge as possible
resulting in a 1 gram needle load. Under unsatisfactory
conditions of motorboard vibration or when playing
records with extremely high modulation, the counter-
balance may be set all the way towards the cartridge,
resulting in a 2 gram needle load. Even with this adjust-
ment, the needle load will be less than one half that which
is normally found in conventional high fidelity reproducers,
with consequent substantial improvement in record and
needle life. The Studio Dynetic reproducer is available
with diamond styli only. To prevent damage, the diamond
stylus is packaged in a separate plastic container and should
only be installed after mounting the arm.

A magnetic type arm rest designed to harmonize with the
appearance of the Studio Dynetic reproducer, is furnished
in the package.

Features:

The Studio Dynetic reproducers embody exclusive improve-
ments which represent a break-through in the art of
phonograph reproduction.

l. The Dynetic Principle employs a moving magnet trans-
ducer which provides extreme linearity and freedom from
distortion. The stylus assembly is readily removable and
can be replaced by the user.

2. Since the magnet turns on its vertical axis, it is possible
to place the diamond tip at the end of a light magnesium
beam providing a needle tip mass of I Mt milligrams. The
stylus assembly is held in a durable elastomer composition
which provides a needle compliance of 7 x 10 cm. per
dyne. Vertical compliance at the needle tip is excellent.
Because of these factors, needle talk is practically non-
existent.

3. The tone arm is made of light high-strength aluminum
in the form of a column tapering toward the front and
reinforced at midpoint for greater strength. Because of this
construction, the arm is devoid of resonance. A new
groove-oriented stylus assembly provides the correct oflset
angle for proper tracking.

4. All of the load bearing pivots are iewelled. The car-
tridge is mounted on a balance beam which has a cross
shaft pivoting in a sleeve-and-cap ruby bearing at either
end. The main arm bearing is a convex ruby thrust bearing.
These bearings are extremely sturdy, durable, and provide
an almost frictionless pivot designed to provide a lifetime
of trouble-free service.

5. The arm is brought into position to play a record by
means of a stylus control button (See Fig. A). The car-
tridge is lifted by pressing the control button. With the
finger pressed down on the button, the arm may be
brought into any desired position on the record. When the
button is released, the stylus contacts the grooves gr
with a force of I to 2 grams ( depending on counter-balm.
adjustment). In the normal operation of the arm, the
cartridge never needs to be touched. By using the control
button, it is next to impossible to damage the record or
the needle.

6. The Studio Dynetic reproducer is fully balanced around
the vertical axis and this provides maximum stability to the
reproducer. The need for leveling of the motorboard is
entirely eliminated.

7. A newly developed dynamic damping system is em-
ployed in the Studio Dynetic reproducer. The counter-
balance is floated on a suspension bar imbedded in special
elastomer damping material (See Fig. A). Any tendency of
the arm to resonate is damped by this member, helping to
keep rumble and boom to a minimum.

8. The extremely low needle force of the Studio Dynetic
reproducer permits the use of a .7 (0.018 mm.) tip needle
in the MI cartridge, instead of the conventional 1 mil
(0.025 mm.) tip needle. The smaller radius improves track-
ing on heavily modulated passages and on the inside grooves
of a record, providing an improvement in fidelity.

Application:

The Models M12 and M16 reproducers are recommended
for the highest quality applications where a lateral repro-
ducer is required, such as playing back master records.
broadcasting, highest fidelity home systems, etc.

The M12 and M16 reproducers have adequate output '
operate all modern preamplifiers. Because of the relatix
low impedance of these reproducers, they may be used in'
installations which require up to 20 ft. (6.1 m.) or so of
cable between the pickup and the preamplifier. The total
cable capacity should not exceed 1500 micro-microfarad.

Installation:

The M12 or M16 reproducer may be mounted on any
convenient place on the motorboard. For optimum tracking
angle reduction, the M16 reproducer is mounted with the
needle tip passing 1%2" (10.3 mm.) beyond the center pin
of the turntable. The M12 reproducer is mounted with the
needle tip passing 1A" (6.4 mm.) beyond the center of the
turntable.

A template is included with the reproducer to facilitate
correct installation of the reproducer and the arm rest with
respect to the turntable.

When properly mounted the Studio Dynetic reproducers
are less subject to the effects of floor vibration than conven-
tional high-fidelity pickups and they will not be unduly
affected by walking, dancing, etc. in the vicinity of the
reproducer. To achieve this type of performance, both the
reproducer and the turntable should be rigidly attached to
the motorboard. In this manner any vibration reaching the
motorboard will act equally upon the turntable and the
reproducer, thus cancelling the effect of vibration. It is
recommended that the motorboard itself be at least 1%
(19.1 mm.) thick and be mounted on a sponge rubber strip
to minimize the possibility of beng set into motion by
vibrations.

The following steps are recommended in installing
Studio Dynetic reproducer (See Fig. A):

1. Remove the cartridge by gently pulling it lengthwise
away from the arm. This is to avoid the possibility of
damage during installation.