Electro-Voice E-V 66 Data Sheet

Electro-Voice E-V 66 Data Sheet
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DESCRIPTION
Representing an entirely new and unique approach
to the design of stereo high fidelity components, the
Electro-Voice E-V 66 stereo control amplifier in-
corporates the latest "state of the art" electronic
devices and circuitry. To ensure proper operation
of the E-V 66, it is urged that the installation pro-
cedure be followed exactly.
The E-V 66 incorporates twenty-six transistores,
of which fourteen are silicon,andfour silicon diodes -
in the power supply. Extremely cool operation is
assured by direct conduction of the small amount of
heat from the output transistors to the unit's heavy
base plate. All components operate well within
their rated temperature range, insuring long life
and exceptional stability.
The use of highest quality transistors and careful
chassis layoutresults in the virtual absence of hum,
hiss, and noise. Wide frequency response, unusually
low distortion, exceptional square wave response,
and other performance characteristics exhibit little
or no deterioration throughout the entire power out-
put range--up to, and including, full power.
The E-V 66 incorporates Automatic Contour Regu-
lation, a unique tone control circuit (patent pending)
linked to the volume control circuit in a manner
which provides an infinitely-variable loudness com-
pensation. Any amount of boost selected on the
bass and/or treble control is regulated by the volume
control to reduce the amount of boost automatically
as the volume is increased, andraise the amount of
boost as the volume is lowered. Flat orattenuated
settings of the tone controls remain unaffected by
changes in the volume control setting. The boost
characteristic of the bass control is exceptionally
useful in compensating for deficiencies in loud-
speaker and room'acoustics--even at the maximum
setting where conventional tone controls tend to
sound unpleasantly "boomy".
4 E-V 66
STEREO
| CONTROL AMPLIFIER
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FEATURES
e Ali-transistor, solid state circuitry - military
type etched circuit wiring
e Cooloperation provides maximum component life
and greatly reduces ventilation requirements
e Extremely flat, wide-range frequency response
SPECIFICATIONS
Power Output: 80 watts IHF music power
(40 watts per channel); 160 watts in-
stantaneous peak power.
Frequency Response: +1.5 db; 8 to 50,000 eps
at rated power,
Channel Separation: 40 db minimum at 1000 cps
Harmonic Distortion: Less than 0. 5%at rated output
IM Distortion: Lessthan 0.5% at rated output
Hum and Noise: High level inputs--better
than 80 db down at rated output.
Magnetic phono input---
better than 70 db down (reference,
10 mv input)
Input Sensitivity: Magnetic phono -- 3 mv
Ceramic phono, tuner, aux, and tape
monitor--100 mv
Controls: Selector (Phono, Tuner,
Aux} Volume: Balance: Base (+20
db, -20 db at 50 cps)*: Treble (+15
db, -15 db at 10 kc)*; Speaker (On-
Mute)
Output Damping Factor: 50 at 8 ohms
Outputs: Speaker (4-8-16 ohms each channel);
stereo tape recorder; stereo head-
phone.
Auxiliary AC Outlets: 2 - one switched, one un-
switched.
Power Requirements: 110 - 120 volts, 50 - 60
cycle АС.
Dimensions: 4-3/32" x 12-3/16" x 9-3/4"
Weight: 9-1/2 lbs.
* Figures represent maximum boostatlow volume
settings. (See text for explanation of Automatic
Contour Regulation circuit.) -
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CONNECTIONS
Note: The AC power cord should not be plugged in
until all connections and initial control settings have
been made.
1. Connect the right- and left-channel speakers to
the right- and left-channel amplifier terminals, re-
spectively. Ordinary #18 lamp- or "zip" cord is
satisfactory. In order to ensure proper stereo ef-
fect, make certain that the speakers are phased
correctly. Most speakers and speaker systems
have one terminal coded red, T1, +, or otherwise
marked for proper phasing. This terminal should
be connected to the amplifier output terminal marked
"4-8-16 ohms". The amplifiercommon terminal,
marked "COM", should be connected to the black,
T2, —, or unmarked speaker terminal. Care should
be taken to keep the speaker wires from touching
each other either at the amplifier or the speaker
terminals. Although no harm will be done to the
amplifier, a short circuit in the amplifier output
will require the unnecessary and bothersome re-
placing of fuses,
2. Connectprogram source (tuner, phono, ete.) to
the appropriate pair of input jacks on the rear panel.
The left jack of each pair is the input for the left
channel; the right jack of each pair feeds the right
channel, If a monophonic source such as a mono
tuner is employed, it may be connected to either
channel input.
3. The phono cartridge selector switch (above the
phono input jacks) should be placed in either the
ceramic (CER) or magnetic (MAG) position, de-
pending upon the type of cartridge employed in the
record player.
4, Normally a separate ground wire is required be-
tween an amplifier and a record player to reduce
hum. This wire shouldbe connected to the SYSTEM
GROUND screw on the amplifier rear panel.
5. If a tape machine capable of recording is to be
used in the system, the recorder's high level inputs
should be connected to the amplifier jacks labeled
OUTPUT TO TAPE RECORDER. High level out-
put from the recorder should be connected to the
amplifier input jacks labeled TAPE, The gain of this
input is designed for tape recorders with built-in
playback electronics; it will not operate directly
from a tape head.
6. For convenience, two AC outlets are provided on
the rear panel. Auxiliary equipment such as a tuner,
record player, or tape deck may be connected to
these outlets as long as the total power consumption
of the additional units does not exceed 300 watts.
The switched outlet is controlled by the amplifier
“ on-off switch;
the unswiiched outlet is on at all
times. Normally a mechanical device such as a
record player or tape machine should be connected
to the unswitched outlet so that it cannot be turned
off at the amplifier with the mechanism engaged.
Before plugging in the amplifier, read through the
following section to become familiar with front panel
controls, in addition to the initial settings.
CONTROL FUNCTIONS
POWER ON/OFF
Controls the main AC power to the amplifier in ad-
dition lo any equipment connected to the switched
AC convenience outlet on the rear panel. This
switch should be in the OFF position before con-
necting the line cord to AC power, and should be in
the OFF position whenever any connection changes
to the amplifier or associated equipment are made.
MONO/STEREO SWITCH
In the STEREO position, the left- and right-channel
input signals are fed through the left- and right-
channel amplifiers to their respective speakers.
In the MONO position, the left- and right-channel
inputs are combined and fed through both ampli-
fiers, with the resulting signal routed to both the
left and right speakers. Similarly, a mono source
connected to either a left- or right-channel input
will be fed to both amplifier channels and then to
both speakers. Either position may be used initi-
ally, depending upon the program source available.
SOURCE/TAPE SWITCH
In the SOURCE position, the signal being fed to the
speakers (phono, tuner, auxiliary) is selectedby
the SELECTOR switch. The TAPE position selects
the tape input (regardless of the position of the
SELECTOR switch) for playback from a tape re-
eorder, NOTE: This switch may also be used to
compare tape quality to material being recorded _
when used with a tape machine providing off-the-
tape monitoring while recording, The tape recorder
instruction book will provide additional details.
SPEAKER ON/MUTE SWITCH
In tie MUTE position, the switch silences both
speakers so that headphones may be used for pri-
vate listening. Although no harm will be done to the
amplifier if this switchisleft inthe MUTE position,
it is suggested that the speakers be turned on after
listening with headphones, so that a person un-
familiar with the equipment will have no difficulty
operating this system.
PHONES JACK
Provides output for high-quality stereo headphones. .
Output is available at all times, regardless of the
setting of the SPEAKER ON/MUTE switch.
tuner input jacks and are dressed neatly along the
rear panels of the two chassis, Normally this con-
nection will never be changed--however, if it should
ever become desirable to attach the tuner output to
another amplifier or connect another tuner to the
tuner input jacks on the amplifier, this inter-
chassis connection may be removed by simply un-
plugging the cables at either or both ends.
Before plugging in the E-V 1177 stereo FM re-
ceiver, read through the following section to be-
come familiar with the front panel controls and
their initial settings.
CONTROL FUNCTIONS
AMPLIFIER SECTION
MONO/STEREO SWITCH
In the STEREO position, the left- and right-channel
input signals are fed through the left- and right-
amplifiers to their respective speakers. In the
MONO position, the left- and right-channel inputs
are combined and fed through both amplifiers, with
the resulting signal routed to both the right and
leftspeakers. Similarly, a mono source connected
to either a left- or right-channel input will be fed
to both amplifier channels and then to both speakers.
Either position may be used initially, depending
upon the program source available.
SOURCE/TAPE SWITCH
In the SOURCE position, the signal being fed to the
speakers (phono, tuner, auxiliary) is selected by
the SELECTOR switch, The TAPE position selects
the tape input ( regardless of the position of the
SELECTOR switch) for playback from a tape re-
corder, NOTE: This switch may also be used to
compare tape quality to material being recorded
when used with a tape machine providing off-the-
tape monitoring while recording. The tape re-
corder instruction book will provide additional
details,
SPEAKER ON/MUTE SWITCH
In the MUTE position, the switch silences both
speakers so that headphones may be used for pri-
vate listening, Although no harm will be done to
the amplifier if this switch is left in the MUTE
position, itis suggested that the speakers be turned
on after listening with headphones, so that a person
unfamiliar with the equipment will have no difficulty
operating the system.
LOUDNESS ON/OFF
To obtain normal or "flat" response at normal
listening volume, this control should be in the OFF
position. However, atreduced volume settings, the
ear is less sensitive to low-frequency sounds, Plac-
ing this switch in the ON position will provide a com-
pensating boost in the bass range to correct this
condition without disturbing the regular tone con-
trol settings.
PHONES JACK
Provides output for high-quality stereo headphones.
Output is available at all times, regardless of the
setting of the SPEAKER ON/MUTE switch.
SELECTOR SWITCH
Selects desired input signal in conjunction with the
SOURCE/TAPE switch described above. Initially,
this control should be set to select the program
source to be used for system testing, The pro-
eram source selected by the SELECTOR switch
also is fed tothe OUTPUT TO TAPE RECORDER
jacks which are not affected by any other operating
control. If it is desired to record a stereo source
on a monophonic recorder, a'"Y" connector (ob-
tained locally ) should be inserted between the
amplifier output jacks and the recorder input jack.
NOTE: Whenthe SELECTOR SWITCH is placed in
the TUNER position, the audio from the receiver's
built-in tuner section will be fed through the music
system and the illuminated "pointer' behind the
tuner dial will be turned on.
VOLUME/POWER OFF
Adjusts the gain of both stereo channels and controls
the main AC power to the amplifier in addition to
any equipment connected to the switched AC outlet
on the rear panel, Initially, the volume control
should be set fully-counter-clockwise (minimum
volume). After the system has been turned on,
the volume control may be advanced until the de-
sired listening level is reached, This control
should be in the POWER OFF position before con-
necting the line cord to AC power, and should be
in the OFF positionwhenever any connection change
to the amplifier or associated equipment is made.
BALANCE
Adjusts the relative volume of the left and right
stereo channels. The center, or "12 o'clock",
position of the control will provide normal balance
in mostinstances, As the control is rotated to the
left (counter-clockwise), the output of the right
channel speaker is reduced, until at the maximum
counter-clockwise position, only the left channel
is playing. The opposite effect occurs as the
balance control is rotated to the right from the
center position. When the MONO/STEREO switch
is in the MONO position, the balance control may
be used.to direct the monophonic signal through the
left, right, or both speakers, It may also be used
to compensate for different speaker efficiencies if
dissimilar speaker systems are employed in the
two channels,
BASS AND TREBLE CONTROLS
Provide adjustment of low-{requency and high-
frequency response, respectively. Normal or flat
response is obtained with both controls in the center,
or "12 o'clock”, position. Counter clockwise
rotation increases the response. Each of these
controls varies the response of both channels si-
mul taneously.
TUNER SECTION
AFC OFF/ON
This switch provides a means of "locking in" a
station to which the tuner has been tuned, thereby
completely eliminating any chance of "drift" and
annoyance of having to readjust the tuning. For
maximum accuracy in tuning in stations, switch
he AFC .OFF/ON-switeb.1o the OFT.position when
tuning. Tune in the desired station according to
the instructions under TUNING AND TUNING
METER, Switch the AFC OFF/ON switch to the
ON position after the station has been tuned in and
it will remain positively locked in place.
TUNING AND TUNING METER
Highly accurate tuning of FM stations from 88 to
108 megacycles is permitted through the use of the
TUNING control in conjunction with the TUNING
METER. For greater tuning accuracy, tuning
should be accomplished with the AFC OFF/ON
switch in the OFF position as described above.
Tune across the dial until the desired station is
reached and, note that as the signal is first heard
the TUNING METER will deflect to the left or the
right. As the dial is then gradually adjusted to-
ward the center of the signal the TUNING METER
moves toward center. Continued tuning in the same
direction (away from the center of the signal in the
opposite direction -from which it was first ap-
proached) will cause the TUNING METER to
correspondingly deflect in the opposite direction.
Precise "oncenter' tuning occurs when the TUNING
METER returns to the center of its tuning scale,
"On center" funing assures minimum distortion
and noise.
MOVABLE STATION MARKERS
As a convenience, the dial locations of your favor-
ite I'M stations can be marked for quick reference
by the three red MOVABLE STATION MARKERS
located just above the tuning dial. These markers
may be positioned at any location by simply sliding
them back and forth.
FULL-TIME STERO INDICATOR LIGHT
Located at the extreme right-hand end of the dial,
the FULL TIME STEREO INDICATOR LIGHT tells
you immediately whether or nol a station is broad-
casting in stereo. This light is triggered by the
19 ke sub-carrier which is present in stereo multi-
plex signals and winks on the instant a stereo signal
is received. It operates regardless of the setting
of the MONO/STEREO SWITCH,
NOTE: Since the random or "white" noise between
stations contains all frequencies, including 19 kc,
an occasional flickering of the FTS INDICATOR
LIGHT may be noticed when tuning between stations,
This condition is perfectly normal and should not
be construed as a malfunction of the unit,
LOCAL/DISTANT SWITCH
(Located on the sloping panel at the rear of chassis)
Normally, for best performance this switch should
be left in the DISTANT position. However, in ex-
tremely strong signal areas (locations which are
«very “close «to-one or more-PM transmitters), a
condition of "overloading' may occur. This phe-
nomena usually takes the form of distorted sound
when listening to these strong signals and/or the
presence of "images" ( the same station ap-
pearing at more than one spot on the dial, some-
times in combination with signals from other
stations). If this condition is noticed, moving the
LOCAL/DISTANT SWITCH to.the LOCAL position
should correct it.
STEREO/ MONO SWITCHING
Switching from monophonic to stereo operation on
FM is accomplished automatically and electroni-
cally by means of a special circuit incorporated in
the tuner. Normally, when operating the tuner,
the STEREO/MONO switch located on the amplifier
section should be placed in the STEREO position,
With this control setting, stations broadcasting in
stereo will be heard stereophonically while mono-
phonic signals will be heard monophonically through
both speakers.
In cases where an extremely weak stereo signal is
tuned in, the normal amount of background noise
or "hiss" which is present under these conditions
may make it undesirable to listen to the signal in
stereo, In such instances the STEREO/MONO
SWITCH may be switched to the MONO position.
In this position the circuit which automatically
switches the tuner into the stereo mode is defeated
and the signal may be listened to monophonically.
NOTE: H"hiss''is presenton other than extremely
distant stations broadcasting in stereo, it is usually
an indication thata better antenna is required. Re-
fer to CONNECTIONS--TUNER SECTION.
SPECIAL PERFORMANCE FEATURE
The FULL TIME STEREO INDICATOR LIGHT
operates at all times when the tuner is tuned to a
stereo signal--even when the SELECTOR SWITCH
SELECTOR SWITCH
Selects desired input signal in conjunction with the
SOURCE/ TAPE switch described above. Initially,
- fhis control should be set to select the program
source to be used for system testing. The program
source selected by the SELECTOR switch also is
fed to the OUTPUT TO TAPE RECORDER jacks
which are not aifected by any other operating con-
trol. NH it is desired to record a stereo sowrce on
a monophonic recorder, a "Y" connector (ob-
tained locally) should be inserted between the ampli-
fier output jacks and the recorder input jack.
VOLUME
Adjusts the gain of both stereo channels. Initially,
the volume control should be set fully-counter-
clockwise (minimum volume). After the system
has been turned on, the volume control may be ad-
vanced until the desired listening level is reached.
- After the normal range of listening volume has been
determined, itis not necessary to reduce the volume
each time the unit is turned on. Because the ampli-
fier employs an independent ON/OFF switch, all
controls, including VOLUME, may bepreset for
use by members of the household unfamiliar with
the various control functions.
BALANCE
Adjusts the relative volume of the left and right
stereo channels. The center, or "12 o'clock",
position of the control will provide normal balance
in most instances. As the control is rotated to the
left (counter-clockwise), the output of the right
channel speaker is reduced, until at the maximum
counter-clockwise position, only the left channel
speaker is playing. The opposite effect occurs as
the balance control is rotated to the right from the
center position. When the MONO/STEREO switch
is in the MONO position, the balance control may be
used to direct the monophonic signal through the
left, right, or both speakers. It may also be used
to compensate for different speaker efficiencies if
dissimilar speaker systems are employedin the
two channels.
BASS AND TREBLE CONTROLS
Provide adjustment of low-frequency and high-
frequency response, respectively. Normal or flat
response is obtained with both controls in the center,
or"12 o'clock, position. Counter-clockwise rota-
tion increases the response. Eachof these controls
varies the response of both channels simultaneously.
OPERATION
After double-checking the initial settings of the con-
trols, the system may be connected to a convenient
AC power source. The position of the controls may
be varied lo compensate for room acoustics, speaker
characteristics, and personal listening preferences.
— EEE LE
Occasionally a "thump" or "pop" will be heard when
the amplifier power swilch is turned on. This is a
natural resultof the time constants employed in the
power-supply filters, and will not harm either the
amplifier or speakers.
CAUTION NOTES
If the amplifier connections have been made cor-
rectly, the E-V 66 amplifier should now be repro-
ducing sound with the utmost fidelity---and will
continue to do so for years to come. Protective
circuitry such as output-stage peak current limiting
and inherently stable design combine with completely
reliable fusing to provide the most rugged and fool-
proof equipment available.
An MDL-2 (2-amp) fuse islocated in the output cir-
cuitof each channel amplifier to protect the speaker
and output transistor stage from continued over-
load. The MD L-2 fuse provides maximum protection
with a safety margin for any program material
played through a speaker with 4-ohm or greater im-
pedance. If additional speakers are desired, make
certain that the combined impedance of all speakers
connected to a channel is not less than 4 ohms. Ef-
fective output impedance lower than 4 ohmswill
cause excessive current flow and continual blowing
of fuses.
If the amplifier is to be checked for sine wave power
output, it is recommended that the output fuses be
changed temporarily to MDL-3 (3-amp). At the con-
clusion of testing, MDL-2 fuses should be reinstalled
to maintain maximum protection with program
material. The AC primary circuitis protected by an
AGC-2 fuse. This fuse should never blow unless
component failure has occurred and the amplifier
requires servicing. Neither of the convenience AC
outlets is protected by the primary fuse.
METHOD OF INSTALLATION
The E-V 66 has been tested for proper operation for
extended periods in high temperature environments.
However, the advantages inherent in a transistor
unit's cool operation will be partially negated if the
E-V 66 is tightly enclosed or installed directly above
a heat generating device such as a radiator or con-
ventional tube-type equipment. Only a normal cir-
culation of air is required; the oiled walnut case,
(model CW1), which is available asan accessory
item incorporates these ventilation considerations.
WARRANTY
The Electro- Voice E-V 66 stereo control amplifier
is unconditionally warranted against defects in
materials or workmanship for two full years from
date of purchase. If difficulty should be encountered
during or after this period, please write the E-V
Service Department for return authorization and
shipping instructions.
CUSTOMER SERVICE
In order to validate the warranty, the enclosed
. Warranty Registration Card should be returned to
Electro-Voice within ten days of purchase. Re-
turning this card also assures that a complete in-
struction manual for the E-V 66 will be sent as soon
as it is available.
The E-V 66 stereo control amplifier is packed to
provide maximum protection---well in excess of
shipping requirements of the Interstate Commerce
Commission. If shipping damage does occur, con-
tact the carrier immediately, requesting inspection
and instructions, or contact the dealer from whom
the unit was purchased,
INPUTS TAPE
INPUT
SELECTOR
SWITCH |
PHONO €
TAPE
o PRE-AMP
TUNER SECTION SOURCE
AUX O—o :
CONTROL
SECTION
MUTE
AMPLIFIER Ets be
e PLD LEFT
SECTION ON" SPEAKER
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° | LEFT
CHANNEL | QUTPUT TO
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MONO STEREO
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OUTPUT
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| РНОМЕ5 (© |
Sn TAPE RECORDER | ©
CHANNEL ; |
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PHONO an, À TAPE | тт IMUTE
= PRE -AMP CONTROL oi
O—o — ©
TUNER SECTION SECTION AMPLIFIER ESA RIGHT
AUN! - Oo SECTION ON SPEAKER
OUTPUT
TAPE т.
INPUT
Figure 1 - Simplified Block Diagram
Switches set for playing stereo records with
speakers on.
Part No. 531336
1164
Ey) ELECTRO-VOICE, INC. / Buchanan, Michigan Litho in U.8.A.
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