Shure PE70rm Schematic

222 HARTREY AVL, EVANSTON. IL. 60204 U.S.A.

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GENERAL

The Shure Model
pletely transistorized, portable
mixer with built-in reverberation, for use with public
address systems and musical instrument amplifiers.

The Model
economical way to use up to four electric guitars,
basses, consolette organs, or microphones, or any
combination of four with your existing amplifier or
system.

The Mixer features:

Adjustable reverberation to simulate the natural

reverberation or echoes of a large concert hall.

Connection provided for use with remote rever­beration On-Off switch.

m

No interaction between channels when volume
controls are changed.
Connection for battery power supply.
Listed by Underwriters' Laboratories, Inc. and
listed by Canadian Standards Association as
certified.

NOTE: Before using mixer, remove shipping screw

Up to
consolette organs, high-impedance dynamic or ribbon
microphones or any combination. If you desire to use
even more instruments and microphones, the mixer
can be connected together with a Shure Model
Mixer. (See paragraph on Interconnecting Two Units.)

The input connections are standard phone jacks

marked
not recommended for use with the

Each input has a separate volume control for bal­ancing sound between instruments or vocalist. A mas­ter volume control simultaneously adjusts volume of

the entire sound system and is an indispensable
feature where the regular amplifier controls are not

readily accessible.

The individual gain controls should generally be set
near maximum (8 or
control adjusted to required output. Individual channel

volume controls not being used should be kept at

minimum gain

Pressure-sensitive adhesive labels are supplied with

the

PE70RM Mixer as a means of identifying the con-

trol and indicating the control position when optimum

results have been obtained. The labels are easily re­moved or easily erased (when using pencil) when

their use is no longer required.

PE70RM provides a practical, efficient and

(located on top of chassis) holding small tag
and discard.

4

inputs per mixer--electric guitars, basses,

1,

2, 3,

PE70RM is a four-channel, com-

microphone/instrument

OPERATION

Input Connections

4.

Crystal or ceramic microphones are

PE70RM Mixer.

Volume Controls

9

on dial) and the master gain

(0 on dial).

Identifying Controls

.

CABLE:

PE68M

SHUREMICRO

MODEL PE7ORM

DATA

SHEET

I

REAR

Output Connections

Connect it to any amplifier. Standard output con­nections work into musical instrument amplifiers,
microphone inputs, or the power amplifier of the exist-

ing sound system.

Guitar Amplifier Output: The jack marked GUITAR
AMP. OUTPUT is a high-impedance medium level out­put designed to feed a musical instrument amplifier.
Any high-quality shielded guitar cable may be used to
connect the mixer to the amplifier.

Microphone Output: The receptacle marked MIC.
OUTPUT is a high- or low-impedance output (selected

by the switch above the receptacle). The output is the

"mixed" output of all input sources and is designed to
feed a 50 to 250
ance amplifier, or tape recorder. The MIC. OUTPUT

receptacle on the mixer is a professional three-pin

male audio
connections.) The Model
cessory) provides a simple and effective method of
connecting the mixer to virtually any PA microphone

input.

MIC. OUTPU MIC. OUTPUT

HIGH IMPEDANCE

MICROPHONE

Power Amplifier Output: The jack marked POWER
AMP. .OUTPUT is a high-impedance high level output

designed to feed a power amplifier in a PA system,

the auxiliary input of a tape recorder, or the tuner

input of a high-fidelity amplifier.
All outputs may be used simultaneously. Example:

The Guitar Output can be used to feed a guitar ampli­fier while using the Microphone Output to feed the
sound system in a club.

When all connections have been made, turn on the

unit and advance the volume controls for desired

results.

Power: Connect the

power line cord to a 108-132 volt

outlet. Voltage is 26 Vdc open circuit (20 Vdc at

max.).

f

Designed

(Q.G.)

series

ohrr microphone input, a high-imped-

connect0r.t (See Figure A for output plug

to

mate

with

or

equivalent connector.

REVERBERATION MICROPHONE/

INSTRUMENT MIXER

VIEW

OF

MODEL

PE70RM

A68C Output Cable Kit (Ac-

LOW IMPEDANCE

(BALANCED

OUTPUT

PLUG

CONNECTIONS

FIGURE A

microphone/instrument mixer

50/60

Hz

ac power

Cannon

XL

series,

Switchcraft

LINE

4

l

mA

A3

I

Copyright

27A1139

1966,

(OC)

Shure

Brothers

Inc.

Printd

in

U.S.A.

Accessory 28-volt DC: To convert to dc operation, this
jack is used as a power input when using the Model
A68B Battery Power Supply (Accessory). When not
using the mixer turn off the switch to conserve battery
life (pilot light does not operate when using

A68B).

Grounding

If there should be objectionable hum, connect the
metal chassis of the mixer to a good ground such as
a metal frame of a wall outlet or a water or steam pipe.
This is normally accomplished automatically through
the ground wire of the power cord.

Reverberation

The red control knob (on front panel) marked RE­VERBERATION is used to adjust the amount of rever­beration to the desired effect.

The standard phone jack (on back panel marked
REVERBERATION REMOTE SWITCH) is used to con­nect an On-Off switch which can be operated through
a single-conductor shielded cable at a remote location
to turn reverberation on and off. See Figure B for
switch connections.

PE70RM Reverberation Mixer and a Shure PE68M

A
five-channel Mixer may, also, be combined to permit
reverberation in all eight

microphone/instrument
channels. In this case, Unit 1 is the PE68M, and
Unit 2 is the

PE70RM.

A. Connect GUITAR AMP. OUTPUT on Unit 1 to

the fourth

MICROPHONE/INSTRUMENT INPUT

on Unit 2.

B. Connect microphones or instruments to mixers

#O

and set each input control to

position.

C. Take output signal for desired application from

appropriate output jack on Unit 2.
D. Set Master Control on Unit 1 to position #4.
E. Set fourth

Control on Unit 2 to position
F.

Master Control on Unit 2 is now Master for all

MICROPHONE/INSTRUMENT INPUT

#lo.

inputs.

G. Advance Master Control (Unit 2) to about

#5
position and adjust individual microphone con­trols for proper level. If overall gain is too low
or too high, Master Control (Unit 2) may be
adjusted.

CONDUCTOR

SHIELD

o

TIP

r

SLEEVE

1

PHONE PLUG

SWITCH

REMOTE

REVERBERATION

FIGURE

SWITCH

B

CAUTION: The PE70RM Reverberation Mixer should

not be set on or mounted against a loudspeaker, as

vibrations from the speaker cabinet may cause im-

proper operation of reverb. Avoid accidental jarring
during operation.

Interconnecting Two Units

1. A

PE70RM Reverberation Mixer and a Shure PE68M
five-channel Mixer may be combined to give a total
of eight

microphone/instrument channels. In this
case, four channels could have reverberation and
four channels would NOT have reverberation. Unit
1 is the

PE70RM, and Unit 2 is the PE68M.

A. Connect GUITAR AMP. OUTPUT on Unit 1 to

fifth

MICROPHONE/INSTRUMENT INPUT on

Unit 2.

B. Connect microphones or instruments to mixers

and set each input control to

#O

position.

C. Take output signal for desired application from

appropriate output jack on Unit 2.
D. Set Master Control on Unit 1 to position #4.
E. Set fifth

Control on Unit 2 to position

Master Control on Unit 2 is now Master for all

F.

MICROPHONE/INSTRUMENT INPUT

#lo.

inputs.

G. Advance Master Control (Unit 2) to about

#5
position and adjust individual microphone con­trols for proper level. If overall gain is too low
or too high, Master Control (Unit 2) may be
adjusted.

SPECIFICATIONS

Gain

At 1,000 Hz, with 33k source

Input

Mic.

Mic.

Imp.

Guitar

Amp.

Power

Aux.

Low

Imp.

High

5.0 mV produces .63 mV 10.1 mV 35.5 mV 14%
Frequency Response

Flat +3 dB, 40 Hz to 20,000 Hz

Hum-Noise

60 dB below rated output.

lnput lmpedance

Inputs suitable for high-impedance dynamic and
ribbon microphones and electrified instruments.

Recommended Load lmpedance

LO IMPEDANCE MIC. OUTPUT

..................

25 to 600 ohms

HI IMPEDANCE MIC. OUTPUT

..................

20,000 ohms or greater

POWER AMP. OUTPUT

.........................

47,000 ohms or greater

GUITAR AMP. OUTPUT

.........................

47,000 ohms or greater

Distortion

Less than 1% THD with LO IMPEDANCE MIC. OUT­PUT at 20
200

mV, and POWER and GUITAR AMP. OUTPUTS

at

2.OV.

mV, HI IMPEDANCE MIC. OUTPUT at

Phase

All inputs and AMP. OUTPUTS are in phase; MIC.
OUTPUTS are out of phase with AMP. OUTPUTS.

Amp.