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Connections:
The M 7 D cartridge utilizes a
4
terminal arrange-
ment for connections having a separate ground terminal for each
channel.
(See Figure 2).
LEFT
I
RIGHT
CHANNEL
C H A N N E L
TERMINAL
T E R M I N A L
\--
RIGHT
1
1
1
CHANNEL
GROUND
GROUND
TERMINAL
TERMINAL
TERMINAL D I A G R A M S
FIGURE 2
For Stereo reproduction terminal R and its ground terminal
represent the right channel (outside groove wall). Terminal
L
and
its ground terminal represents the left channel (inside groove wall).
To use a 4-lead arrangement connect each section of the
cartridge t o separate amplifiers. To prevent "ground loops" and
hum, no common connection should exist between the two amplifier
systems.
When used with a 3-lead arrangement, the shield
lead
should be connected t o both o f the ground terminals a t the cart-
ridge.
N o other common ground connection should exist.
For single channel reproduction o f Monaural or Stereo re-
cordings, connect the "hot" lead t o both R and
L
terminals and
connect the ground or shield lead t o both of the ground terminals
marked
6.
For )-lead
arrangement and for single channel reproduc-
tion, a "double loop" pin iack is provided t o make a convenient
connection between the two ground terminals-simply
slide the
loop ends onto the ground terminals.
This connection should be
made before connecting the regular terminal jacks t o the cart-
ridge. Connect ground pin jack t o either ground terminal.
Caution:
Do not make solder connections t o cartridge termi-
nals. Make all solder connections t o terminals jacks provided.
of leads (see connection) t o each preamplifier. In general, these
leads should be connected t o the "low level" phono input. Again,
the instructions that come with each of your ~ r e a m ~ l i f i e r s will be
your best guide in making these connections.
A f t e r making the cartridge connection,
it
is necessary t o
balance the system by adjusting the volume from each channel un-
til
they are equal. To do this, play a monaural record with the
stereo cartridge. Adjust the volume control on one preamplifier
until you have the sound as loud as you want
it.
Then, adjust the
volume on the second preamplifier t o match the first.
It
will become apparent t o you when performing the opera-
tion that you will have t o adiust the balance between the channels
every time you wish t o raise or lower the volume. There are several
rel'atively inexpensive devices available that provide a solution t o
this problem by means o f a master volume control that controls the
sound level from both channels with a single control.
The dealer
from whom you purchased your stereo dynetic will be able t o give
you information on a device o f this type.
Speaker Placement:
Because acoustic factors
vary
SO
greatly from room t o room,
it
is impossible t o establish a definite
rule o f speaker
location for
optimum
results.
In general, the
speakers should be placed along the wall of the room opposite the
most comfortable listening area. The speakers should be separated
by a distance equal t o
1/2
t o
3/4
of the width o f the wall against
which they are placed.
It
is well t o keep in mind the fact that the
farther apart the speakers are the farther away you will be able
t o sit and still achieve good results. Also, the closer together the
speakers are, the closer you will have t o sit and the fewer the
number of people that will be able t o listen at one time.
By ex-
perimenting with the placement o f the speakers, you can determine
the location that will give the best results in your particular room.
STYLUS REPLACEMENT
Special Note:
Because the stylus-magnet assembly plays
such an extremely important p a r t in the overall perform-
ance of the Stereo Custom Dynetic Phono Reproducer, be
certain that any replacement stylus is a genuine Shure
"Stereo Custom Dynetic" stylus.
The stylus assembly, when installed in the cartridge is practi-
cally immune t o damage during normal usage.
However, care
should be taken t o avoid bending or distorting the stylus assembly
when
it
is installed or removed.
Phasing:
It
is important t o maintain correct phasing o f both
loudspeakers.
Although the phasing o f the M 7 D cartridge is care-
fully controlled, there are many possibilities where a particular
H i g h Fidelity system can cause opposite phasing o f the sound from
the speakers. The phasing can be easily checked b y a listening test.
Play a monaural record using the M7D. Reverse the connections o f
the wires t o one speaker. This can be done at the amplifier or the
speaker, which ever is more convenient.
When the sound appears
t o come from a point halfway between the speakers, they are In
phase. Also, bass reproduction will be much fuller when speakers
are correctly phased.
Associated Equipment:
For reproducing stereo records
you require the same basic equipment that you need for playing
monaural records. However, you will need two amplifiers, two pre-
amplifiers and two speakers. I f you already have a monaural system
then you need t o add the extra preamplifier, amplifier and speaker.
You will also have t o add another set o f leads t o your tone arm f o i
the second channel. Figure 3 shows typical stereo systems.
Tqiiir-1
POWER AMPLIFIER
POWER
AMPLIFIER
COMBINATION
COMBINATION
TYPICAL STEREO SYSTEMS
FIGURE 3
I f your system is represented by Figure 3A, merely follow
the connection instructions that accompanied your stereo preamp-
lifiers.
If
your system is represented by Figure 3B or 3C, consider
your stereo dynetic as two separate cartridges and connect one set
NEEDLE REPLACEMENT
FIGURE
4
Stylus replacement is simple and fast.
(See Figure 4). To
replace
(Step I)-Insert
fingernail file (or a similarly pointed
tool) behind the lip a t the front of the stylus spade. Care must
be taken not t o deform needle shank (portion holding needle t i p )
or spring wire in the stylus assembly.
(Step 2)-Withdraw
stylus
by pulling forward out o f cartridge-lift
completely out with thumb
and forefinger.
(Step 3)-grasp
new stylus between thumb and
forefinger and insert into stylus socket cartridge.
(Step 4)-Press
stylus into socket until
it
is firmly seated.
A p p l y pressure a t the
front portion o f the spade. Care must be taken not t o allow the
finger t o slip off o f the front of the stylus spade resulting in dam-
age t o the stylus tip.
Guarantee:
The M 7 D Stereo Custom Dynetic Cartridges are
guaranteed t o be free from electrical and mechanical defects for
one year from date o f shipment from the factory, provided all
instructions are complied with fully. The Guarantee does not cover
needle wear nor does
it
cover damage t o the needle assembly from
abuse or mishandling.
Patent Notice:
Manufactured under
U.S.
patents 3,055,988,
3,077,521, 3,077,522. and D187.230. Other patents pending.
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