Shure M91ED-BJ User Guide
222
HARTREV
AVE..
EVANSTON.
IL.60204 U.S.A.
MICROPHONES AND ELECTRONIC COMPONENTS
AREACODE312/328.9000 . CA8LE:SHUREMlCRO
MODEL
M91
ED-BJ
DATA
SHEET
STEREO DYNETICB
mrR.C/C
PHONOGRAPH CARTRIDGE
HEAD ASSEMBLY
FOR MIRACORD AUTOMATIC
TURNTABLES TRACKING
3/4
-
1%
FROM
GRAMS
SPECIFICATIONS
FREQUENCY
RESPONSE:
OUTPUT VOLTAGE:
CHANNEL
SEPARATION
CHANNEL
BALANCE:
l NPUT IMPEDANCE:
INPUT
CAPACITANCE
INDUCTANCE:
D.C. RESISTANCE:
STYLUS MODEL
N91ED
TRACKING FORCE:
LIGHT TRACKING FORCE WITH HIGH TRACKABILITY:
lighter the tracking force the longer the life of the stylus and
records provided the
losing
unbroken flow of signals
Signals recorded at a
to track properly. This stereo
trackability at light tracking forces.
TRACKABI LITY:
At a stylus force of 1 gram
(Higher
GENERAL:
stereo phono cartridge mounted in a Miracord pickup head.
The Model
Automatic Turntables tracking from
:
iontact. A cartridge tracking properly provides an accurate
stylus
This model is an improved high quality "Hi-Track"
M91ED-BJ is designed specifically for MIRACORD
From 20 to 20,000 Hz.
5.0 millivolts per channel at 1,000 Hz.
at 5
cm/sec.
Nominally 25 db at 1,000 Hz.
Within 2 db of each other
Nominally 47,000 ohms (per channel). Can
be up to 70,000 ohms with almost inaudible
change in frequency response.
:
400-500 picofarads per channel including
tonearm wiring and amplifier input capacitance.
720 millihenries
630 ohms
Replacement : Grip Color-Yellow
ELLIPTICALLY SHAPED NUDE DIA-
MOND TIP
,0002 inch (5 microns) side contact radii
,0007 inch (17.8 microns) frontal radius
.0010 inch (25.4 microns) between points
of contact with groove.
%
to
1%
grams
s&lus can follow the groove without
frorn the record groove to the amplifier.
,
h~gher level (cm/sec.). are more difficult
1,000 Hz. - 33 cm/sec
10,000 Hz. - 19 cm/sec
forces within specified range improve trackability.)
Dynetlc cartr~dge provides high
-
400 Hz.
22 cm/sec
.?/4
to
1%
grams.
The
INSTALLATION
1
R~mnve nres~nt ~icku~ head and insert Shure Model into
-.
-. . . . - .
phono irk. careAmus< be taken in ren~oval and inserting of
the pickup heads not to cause damage to the stylus. For
maximum safety, leave the stylus guard on the cartridge
during removal-or insertion of pickup head.
2. Balance arm as per Miracord instructions and set stylus
force indicator to recommended tracking forces. Forces
greater than the indicated "maximum" should not be used.
SUGGESTIONS FOR CLEANING YOUR STYLUS:
the stylus use a camel's-hair brush (No. 2 size or smaller)
dipped
lig);tly in alcohol or alcohol-water solution; grain alcohol
is preferred. (WARNING:
solutions may cause corrosion and permanent stylus damage.)
The alcohol will remove any sludge deposits which may have
coated the stylus tip. The, brush bristles should be trimmed to
a length no longer than
a forward movement from the rear (terminal end of the car-
tridge) to the front. NEVER brush or wipe the stylus from
front to back or side
RECORD,CLEANING:
immerse it
and lukewarm or cool water (preferably distilled water). Use a
lint-free cloth to work the mixture into the grooves, following
the grooves around for a thorough cleansing. Then, rinse with
clear, cool or lukewarm water (preferably distilled) and dry
with a lint-free cloth.
111
a solution of mild dishwashing liquid detergent
Commerc~al record or stylus cleaning
%
Inch. ALWAYS brush the stylus with
to
side
An effective way to clean a record is to
EASY STYLUS REPLACEMENT
Grasp molded housing of stylus
between thumb and forefinger. Gently
withdraw stvlus bv
out of
cartrfdee. Gris~ reblacement
stylus between thumb ind lorefinger
and insert Into stylus socket. Press
stylus into socket until molded
inp of the stylus mates with the
cartridge
not to allow the finger to slip off
the molded housing of the stylus
resulting in damage to the stylus
tip or shank.
SPECIAL NOTE:
tridges is the most critical component. To maintain the original
performance standards of your cartridge, be certain that any replacement stylus you buy bears the following .certification on the
package: "This Stereo
by Shure Brothers Inc.
AVOID INFERIOR IMITATIONS. THEY WILL SERIOUSLY
DEGRADE THE PERFORMANCE OF YOUR CARTRIDGE. ALL
GENUINE
SHURE BROTHERS INC.
GUARANTEE:
to
one year from the date of purchase. Please retain proof of
purchase date. This guarantee includes all parts and labor.
This guarantee does not include stylus wear.
SHIPPING INSTRUCTIONS:
return it prepaid to the factory. If outside the United States,
return the unit to your dealer or authorized Shure Service Center
for repair. The unit will be returned to you prepaid.
PATENT NOTICE:
U.
case.. Care must be taken
be free from electrical and mechanical defects for a period of
S, Patents 3,055,988, 3,077,521, 3,077,522 and 3,463,889.
~ullinz forward
hous-
STYLUS REPLACEMENT
The Dynetic stylus assembly used in these car-
Dynetic stylus is precision manufactured
DYNETIC" STYLI ARE MANUFACTURED BY
This Shure product is guaranteed in normal use
Carefullv re~ack the unit and
Cartridge and stylus manufactured under
To clean
e
Copyright 1972, Shure Brothers Inc. Printed in
27A918 (LB)
U.SA
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