Shure m64 owners manual

Page 1

' 222 HARTREY AVE., EVANSTON, IL, 60204 USA.
snu AREA CODE 312/866-2200 - CABLE: SHUREMICRO DATA SHEET
wa: 910-231-0048 TELEX: 72-4349 MODELS M64 AND M64-2E

noun or 1»: manual... WORLDWIDE

MICROPHONES AND ELECTRONIC COMPONENTS STEREO PREAMPLIFIERS

mm m

u a
(9 - i 3
9 3
a -' . '
GENERAL SPECIFICATIONS
The Shure Models M64 and M64»2E Stereo Pre- Gain
amplifiers are designed to furnish the voltage gain Gain measured at 1 kHz with input through 680
and equalization necessary to operate magnetic ohms and output terminated in 47 kilohms.
phono cartridges (such as the Shure DYNETIC® Equalizauon High Level Low Level
Cartridges), and tape playback. heads wIth audIo Switch Position oupu output
amplIerrs that have no equalIzatIon. ln addItIon, the FI t 27 5 dB 4 0 dB
units may be used without equalization for micro- PIIIono :34'5 dB :11'0 dB
phones or as buffer amplifiers. Tape +37:0 dB 35 dB
Typical Applications: Frequency Response
- Conversion of stereo record playing systems Flat: i 2 dB from 20 Hz to 20 kHz
from ceramic to magnetic cartridges. Phono: 1r 2 dB of the Standard RIAA curve from
- Preamplifier for microphones. 40 H210 15 kHz

- Low gain buffer amplifier where long cable Tape: 1 2 (3 0f the 7'/2 IPS NAB curve from
lengths are extended to a preamplifier input. 50 HZ to 15 kHz

Advantages include complete freedom from micro-
phonics, extremely low noise, the ability to use
15m (50 ft) or more of output cable, and years of
maintenance-free performance. The operating tem-
perature range is from 7°C (20°F) to 57°C (135°F).

The Model M64 operates on 108-132 volts, 50/60
Hz power line, or from an auxiliary 24 to 36 volt dc
supply such as the Shure Model A67B Battery Power
Supply. The M64-2E is identical to the M64 except
that it operates on a line voltage of 216-264 volts,

0

am rn-I- mun numr
S 6

B

mo

moo Imam moon
snzuumm 1 Mint

50/60 Hz. TYPICAL FREQUENCY RESPONSE
FIGURE 1
The Model M64 and M64-2E feature a single 3 Distortion
position slide switch for selecting equalization for Under 1% total harmonic distortion for an output
phono, Tape, or Flat. The phono position provides of 2 volts at 1 kHz In Phono, Tape or Flat posmons.

In the Phono position the total harmonic distortion

the Standard FllAA EqualIzatIon for phono records. is less than 1% at 30 Hz with 2 volts output.

The Tape position provides the Standard 7V2 IPS
NAB Equalization for tape, and the Flat position Clipping Level

provides a flat amplifier for microphones 0" as a The minimum input clipping levels at 1 kHz are:
buffer amplifier formagnetic phono cartridges when Flat: 250 mV

long lines or switching systems are necessary Phono: 100 mV

between the turntable and main equalized pre- Tape: 80 mV

amplifier. (NOTE: When used as a buffer amplifier,
the Low Level Outputs should be used). The input Channel Separation

and output jacks will accept standard phono plugs. 50 dB or better at 1 kHz

There are input jacks for Channel 1 and Channel 2;

output jacks for Ch. 1 High Level, Ch. 1 Low Level, Channel Balance

Ch. 2 High Level, and Ch. 2 Low Level. Channels matched within 2 dB at 1 kHz

Copyright 1984, Shure Brothers Inc.
27A2076 (DB) Printed in U.S.A.

Page 2

Hum and Noise
Phono: Better than 71 dB below 10 millivolt
input from 20 Hz to 20 kHz
Flat: Better than 64 dB below 10 millivolt
input from 20 Hz to 20 kHz

Operating Voltage
M64: 120 volts t 10%. 50/60 Hz or 30 volts
t 20% dc. Listed by Underwriters
Laboratories, Inc. (Applies to Model

M64).

M64-2E: 240 volts i 10%, 50/60 HZ or 30 volts

1 20% do

Battery Operation

The M64 and M64-2E may be powered by three
Eveready 216 Batteries in series or equivalent
power source connected to 30 V.D.C. jacks. Battery
life is over 100 hours. The Shure Model A67B
power supply. or power jacks on Shures Models
M63. M67. or M68. may be connected to the 30
V.D.C. jacks to power the M64 or M64-2E. These
jacks, which provide 29 Vdc (26 Vdc at 5 mA max),
can also be used to power external equipment.

Input Impedance
Resistance is 50,000 ohms at 1 kHz
Capacitance is 350 pF

Output Impedance

High Level: Less than 1000 ohms at 1 kHz (mini-
mum recommended load is 22,000
ohms)

Low Level: 600 ohms (any load on Low Level
output will not affect input clipping
level)

Dimensions

See Figure 2

Weight

794 grams (1% lb)

Power Consumption
5 watts

Temperature Range
Operating: -7°C to 57°C (20°F to 135°F)
Storage: -29°C to 71°C (-20°F to 160°F)

INSTALLATION

should be located away from motors or other hum
producing power sources and away from intense
heat sources. Should hum be a problem in a given
system or installation, one or more of the power
plugs may be reversed to reduce hum. If the turn-
table has a grounding wire. this wire may be con»
nected to the ground screw on the Preamplifier
to reduce hum pickup.

WARNING
The use of the M64 and M64»2E Stereo
Preamplifier with power amplifiers of the
transformerless (ac-dc) type may result in a
shock hazard. A suitable power line isola-
tion transformer should be used with such
equipment.

To reduce the risk of fire or electric shock
do not expose this appliance to rain or

The M64 and M64-2E Preamplifier may be mount-
ed to an amplifier chassis or cabinet by means of
screws passed through mounting slots at base of
M64 and M64»2E Preamplifier chassis. The Pream-
plifiers can be mounted in any position for normal
operation. but for best results, the Preamplifiers

OPERATION
Connections:

a. Set selector switch to the desired function.
This automatically selects the proper equali-
zation (frequency response) for both channels.

b. For the equalized Phono (RIAA) or Tape (NAB)
position. connect the signal leads from the
phono cartridge or tape head to the jacks
marked Channel 1 Input and Channel 2
Input. * For the Flat position using two
separate high»impedance microphones. con»
nect the cable from one high-impedance mi-
crophone to jack marked Channel 1 Input.
The cable from the other high-impedance
microphone should be connected to the jack
marked Channel 2 Input. For single high-
impedance microphone applications connect
to either Channel 1 or Channel 2. NOTE:
If low-impedance microphones are to be used.
a suitable input transformer such as the Shure
Model A95 Series should be used. Attention
must be given to information contained in the
data sheets of the phono cartridges. tape
heads. or microphones regarding their con»
nections. phasing and grounding.

c. Connect Ch. 1 and Ch. 2 (High Level or Low
Level) output jacks to the corresponding input
jacks of the power amplifier, preamplifier.
tape recorder or mixer.T If it is found neces-
sary to ground the M64 or M64-2E Preamplifier
chassis. ground connection may be made

* The Flat position may be used for high»impedance

microphones. or for phono cartridge or tape head
buffering applications in which the output of the
M64 or M64-2E is connected to an equalized am-
plifier input.

TThe High Level outputs may be connected to
high-level auxiliary inputs. and the Low Level
outputs may be connected to low-level micro-
phone inputs (or equalized phono or tape head
inputs in buffering applications).