MAY
$955
MODEL
UNI-DIRECTIONAL ULTRA-CARDIOID RIBBON ELEMENT
Multi-Impedance
Specifications
Response Frequency Characteristic:
15,000
c.p.s. uniformity insured to plus or minus 2%
Especially designed to meet the exacting requirements
of TV and radio broadcasting. Readily accessible
music" switch adiusts frequency characteristic for optimum performance: ideal for
for the speaker or soloist working at close range, or for
the distant instruments of the orchestra.
Polar Pattern:
pickup of undesired sounds. Response at rear down
:o 20
db
from front. See Figure D.
1000
C.P.S. Response
Model 333 "L" Position
Open Circuit Voltage Level.
Power Level into 50 ohms.
RETMA Microphone Rating
G~I
Model 333
Open Circuit Voltage Level.
Power Level into 150 ohms.
RETMA Microphone Rating
GM
Model 333
Open Circuit Voltage Level.
Loaded with 250 ohms..
RETMA Microphone Rating
G~I
0
()
(**)
(***)
db
0
db
RETMA Standard
Uni-Directional for 73% reduction of
(Sensitivity).
"Mu
Position
(Sensitivif~)
"H"
Position
(Sensitivity)
=
I
Volt Per Microbar
=
I
Milliwatt with 10 Microbars
adiusting frequency response
.......
.........
............
.....
.....
.................
.......
.................
SE-105,
August 1949.
From 30 to
.-
.-
-
.-
-
-1
.-
....
-
-1
"voice-
87.0
db'"
60.0
db*"
153.0
db""*
81.0
db"
59.0 db:k':"
53.0
db"""
79.0
db"
59.0
db**:
5 1.0
db*'""
db.
12
"333"
STUDIO MICROPHONE
Rated Impedances:
multi-impedance switch furnishing a choice of three im-
pedances-"L" (50 ohms);
ohms).
Cable:
with Cannon
20 foot Broadcast 2-conductor shielded cable
XL-3-1 I connector attached.
Shock Mount:
rubber construction.
Swivel:
lifetime swivel permits tilting the head
70" backward.
Copyright
Shure
New improved adjustable "positive action"
1954.
Patents Pending.
Shure
Model "333"
"M"
Special vibration isolation unit of live
I3rothel.s.
Iilc
is
equipped with a
(150 ohms);
45' forward and
"H"
(250
in
U.S.A.
Dimensions:
Finish:
with beige grill.
Stand Thread:
or
5/8"-24 thread available upon request at no extra
charge.
Weight:
Code Word:
General:
directional Microphone. An improved ribbon element
(coupled with a newly designed
vides an Ultra-Cardioid uni-directional characteristic
which gives
acoustic conditions.
phone at a distance from the performer 92% greater
than
is
microphones. The Model
reflection and pickup of undesired random sounds by
730Jo, thus minimizing disturbing studio noises often heard
in telecasting, and radio broadcasting. The sound
received through hundreds of tiny apertures in the acoustically streamlined external grille which filters out wind,
blast, and breath noises.
The extended smooth frequency response and the attending faithful reproduction is largely due to a sensitive
metallic ribbon carefully suspended between the poles of
the magnetic structure. The use of high efficiency magnetic materials and specially designed magnetic circuits
has made
and still achieve maximum operating efficiency. By means
of a selective switch the frequency characteristic may be
adjusted to permit best results during voice or music
pickup. (See "Operation"). The microphone
built to withstand hard usage and
perature and humidity variations. To prevent mechanical
vibration pickup, the Model "333" is
isolation unit of live rubber construction. The 20 foot
Broadcast-quality shielded two conductor cable is supplied with a Cannon microphone plug.
The "333" meets
maximum quality and minimum size.
adjustable swivel permits tilting of the head through
45 degrees forward and
simple to aim the microphone at the source of sound.
See Fig.
Combination non-reflecting Baked Bronze case
5/8"-27. Adapters for
Net weight
RUDUC.
The Model "333" is a slender, compact Uni-
highly satisfactory operation under adverse
possible with non-directional (omni-directional)
it
possible to develop this small microphone
C.
l/z"
pipe thread
1
v2
Ib.;
Packaged weight 4
phase-shift network) pro-
It
permits placement of the micro-
"333" reduces reverberation,
is
is
unaffected by tem-
provided with an
the most exacting requirements for
A
new trouble-free,
70
degrees backward making
Ib.
ruggedly
it
care should be taken that the cable does not
A.C.
power lines for long distances.
Connections:
a multi-impedance microphone.
directly to a 50 ohm line, a
line. Selection of these impedances
removing plate at the rear of the mcrophone and changing the position of the switch. The switch positions are
marked
dium impedance (150 ohms) and
number
to the shield of the cable.
and No. 3 are connected to the internal elements, and
the microphone may be used with a balanced line. The
Model "333" may be connected directly to a standard
low or medimum impedance input
mended where unusually long cable lengths are required
or under conditions of severe hum disturbances. For
additional lengths of cable, a broadcast quality two
conductor shielded cable may be used. The
cable length
is
sponse nor level is appreciably affected.
"L"
The microphone
I
The low and medium impedance positions are recorn-
The Model "333" Studio Microphone
It
may
150 ohm line, or a 250
is
accomplished by
for low impedance (50 ohms),
"H"
for 250 ohms.
plug
is
the Cannon XL-3-1 I plug. The
pin is connected to the microphone case and
is
practically unlimited, since neither re-
FOR 250 OHMS USE "H" POSITION
SINGLE CONDUCTOR SHIELDED
CABLE CABLE
EXCESS OF
MATCHES EITHER 50 OHMS OR
250 OHMS TO
LENGTH
7'
HIGH IMPEDANCE
(See Figure
ampiifier (Fig.
NOT IN
be
connected
"M"
B.)
Pins No. 2
permissible
~arallel
is
ohm
for me-
A-I).
Applications:
of broadcast, television and recording because
trolled within close tolerances in frequency response and
directivity.
address,
provides an easy solution to the feedback problems in
reverberant locations; facilitates orchestral placement;
permits best utilization of space in small broadcast studios;
and provides significant reduction of unwanted noises.
bofh indoors and outdoors.
The true uni-directional characteristic of Model "333"
Instailation:
a standard
conventional desk, banquet, or floor stand. Adapter
stand couplers are available at no charge for
thread or
To avoid
A.C.
The Model "333" meets all requirements
it
is
con-
It
is also ideal for highest quality public
The Model "333" Studio Microphone has
5/8"-27 thread and may be mounted on any
v2"
5/8"-24 thread. (Write Shure Brothers, Inc.)
hum induction when long lines are used,
pipe
z
0
m
m
I.
',
W
I
w
,j
TRANSFORMER
VOICE
-
SWITCH
FIG.
A
INTERNAL CONNECTIONS
RECEPTACLE ASSEMBLY
MUSIC
FIG.
B
CABLE- PLUG
For use with high impedance amplifiers, Shure Model
A86A Cable-Type Transformer is available for coupling
the low impedance line to the amplifier input as shown
in Fig. A-2. The double winding primary of the Shure
Model
either a
pedance input.
ly
shock hazard during operation of amplifying system.
bias at the input tube,
condenser between the microphone and the input
circuit.
A86A Cable-Type Transformer permits coupling
50
ohm line or
The shield, chassis or amplifier ground should be secureconnected to a water pipe or similar ground to prevent
When used with amplifiers using the grid leak
250
ohm line to the
it
may be desirable to use
high
type of
.OI
mfd.
grid
im-
Operation:
care are necessary in the operation of Model
Studio Uni-directional microphone.
ciently and dependably under all ordinary conditions in
hot and cold climates. To retain the full strength of the
highly efficient permanent magnet and to maintain
alignment of the structure, dropping or other severe
mechanical shocks should be avoided.
To adjust swivel tightness,
and adjust slotted swivel screw. Lock swivel screw in
place by securely retightening hex nut.
The Model
by
music
the front of the microphone in the lower part of the
stand connector. In voice position the low frequency
response
Caution:
the ribbon element, do not check the continuity of the
microphone with a circuit tester or an ohmmeter.
Acoustic Considerations:
sponse-frequency characteristic of the Model
microphone is ideal for high-quality reproduction of music
and speech.
"Ultra-Cardioid" describes the horizontal polar characteristic.
but is more directional. There
angle at the front of the microphone, while the rear re-
sponse
I2 to
20
istics over a broad range of frequencies. In broadcasting
and recording
one to point the back of the microphone at unwanted
noises, thus, giving interference-free pickup of desired
sound. Pickup of reverberation energy is decreased approximately
In high-quality Public Address, feedback-free repro-
duction
considerable feedback with conventional semi-directional
or omni-directional microphones.
No special precautions beyond ordinary
It
will operate effi-
if
necessary, loosen hex nut
"333"
may be adapted for either voice or
adjusting the position
is
attenuated
To prevent serious or permanent damage to
This
polar characteristic resembles a cardioid,
is
down from the front response approximately
db.
The Model
this
by
"333"
Yype
04
the switch located at
means of a high quality choke.
The smooth wide-range re-
is
a wide useful pickup
provides these character-
04
polar characteristic enables
73%.
is
assured at volume levels which would cause
"333"
"333"
FIG.
C
C
---I
Guarantee:
from electrical and mechanical defects for a period of
one year from date of shipment from factory, provided
all instructions are complied with fully.
age, return the microphone to the factory for repairs.
Our guarantee
to accident or abuse or
Each microphone
is
voided
if
the microphone
if
the case
is
guaranteed to be free
In case of dam-
is
subjected
is
opened.
e
MODEL
"333"
Architect's Specifications
The microphone shall be a moving ribbon type microphone with a frequency range of
c.p.s. This unit shall have a uni-directional horizontal polar characteristic. The cancellation at the rear shall
be in the order of
for adjusting the microphone impedance to
(sensitivity) at
The microphone shall be provided with a swivel adjustable from
backward. The microphone shall be equipped with a vibration-isolation unit in combination with the stand
connector, and
shielded cable.
The microphone will mount on a stand having
+-
1/4
inches in height,
15
db.
The microphone shall be equipped with a three-position impedance change switch
50
ohms,
150
ohms, or
1000
c.p.s. shall be within
"L"
Position of switch..
"M"
Position of switch..
"H"
Position of switch.
RETMA Standard
it
shall have a detachable Cannon cable connector capable of connecting to a two-conductor
I
7/32
t
1/8
F 2 db of the following levels.
................
...............
................
SE-
105
August
yaw-27
inches in width, and
thread.
1%
250
ohms. The microphone rating
.-I53
.-I53
.-I51
db
db
db
1949.
45
degrees forward and
The overall dimensions shall be
l/s
inches in depth.
30
to
70
15,000
GM
degrees
7%/32
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