Shure M7D Datasheet

222 HARTREY AVE
r
EVANSTON I L L . CABLE SHUREMICRO
I
MODEL M7D STEREO
D A T A SHEET
CUSTOM DYNETIC
CARTRIDGE
EVANSTON PHONE OA 8 9 0 0 0
.
CHICAGO PHONE SH 3 1600
(Stylus Model N7D)
1
SPECIFICATIONS
Response Frequency Characteristics:
From 20 to
15,000 c.p.s.
O U + ~ U + Voltage:
5 millivolts per channel.
Channel Separation:
M o r e than 20 d b a t 1000 c.p.s.
~ecommended Load Impedance:
47,000 ohms (per chan-
nel) f o r Stereo. 22,000 ohms for Monaural (see connections).
Higher values will produce a slight increase in high frequency re-
sponse.
Stylus:
Number N7D.
Radius .0007" (0.018mm) Diamond.
Compliance:
VERTICAL
1
3. 5 x 1 0 - 4 centimeters
H O R I Z O N T A L
1
per dyne
Tracking Force:
4 t o 7 grams ( 5 grams optimum).
Inductance:
420 millihenries.
D. C. Resistance:
280 ohms.
Terminals:
4 terminals.
A n independent ground terminal for
each channel. (See Fig.
2).
Mounting:
Standard
1/2'1
(12.7mm) mounting centers using
#3
or 4 machine screws. .437 ( I l.lmm) mounting centers using #2
machine screws.
Weight:
7.9 grams 1.28 ounces).
Packaged Weight:
2 ounces (56.7 g).
General:
The M o d e l M 7 D Stereo Custom Dynetic Phono Cart-
ridge has been developed for use i n all high fidelity applications.
It
has been designed t o connect into magnetic and constant ve-
locity inputs.
The Model M 7 D is completely compatible.
In other words,
the Model M 7 D will play Stereo Discs Stereophonically, Monaural
Discs Monaurally, and Stereo Discs Monaurally without excessive
wear and without distortion.
The Model M 7 D utilizes the same Moving Magnet principle
employed in both the Studio and Professional Dynetics and offers
the same important features, such as:
H i g h needle compliance.
Low needle talk.
Low tracking forces.
W i d e range frequency response.
Magnetic induction from external fields is reduced t o
a minimum.
N o magnetic attraction t o steel turntables.
Mounting:
The M 7 D Cartridge has standard
y2"
(12.7mm)
mounting centers. Two #3-48 machine screws are supplied with each
cartridge for mounting purposes. By using #2 machine screws, the
cartridge can be mounted on .437 ( I l.lmm) mounting centers. It
is important during installation, that the line on the front o f the
cartridge be perpendicular t o the turnable or record surface.
If
no adjustment is available t o d o this, a paper or metal shim can
be used on one mounting post t o adjust angle o f cartridge.
DIMENSIONAL DRAWING
FIGURE I
The recommended needle point force for optimum results
is
5
grams. When replacing magnetic cartridges, adjustment is
generally unnecessary. Should
it
be necessary, adjustment may
usually be made by adjusting the counter balance or spring a t rear
of arm. Forces u p t o 7 grams may be used
if
needed t o provide
proper cycling o f the record changer.
Copyright 1958 Shure Brothers. Inc.
27A142 (10-63)
Printed in U.S.A.