Hafler 915, 0915P User Manual
Haflee
HOME AUDIO COMPONENTS
I E R
Series 915 Preamp
Series
P R E A M P L I F
0915
NOTICE - IMPORTANT SAFETY INFORMATION
The lightning flash with arrowhead symbol within
an equilateral triangle is intended to alert the
user to the presence of uninsulated “dangerous
RISK OF ELECTRIC SHOCK
00 NOT OPEN
A
voltage” within the product’s enclosure, that may
be of sufficient magnitude to constitute a risk of
electric shock to persons.
WARNING: TO PREVENT FIRE OR
SHOCK HAZARD, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
1.
READ INSTRUCTIONS
All the safety and operating instructions of your Hafler equipment should be read before power is applied to the
equipment.
2.
RETAIN OWNERS MANUAL
These safety and operating instructions should be retained for future reference.
HEED WARNINGS
3.
All warnings on the equipment and in the operating instructions are important and should be followed.
FOLLOW INSTRUCTIONS
4.
All operating and use instructions are important and should be followed.
HEAT
5.
The equipment should be kept away from areas of high temperature, such as heater vents, radiators, stoves/ovens,
fireplaces, etc.
6.
VENTILATION
The equipment should be used in an area suitable for proper ventilation. Care should be taken not to impede airflow
in and around the cabinet. Do not mount on a carpeted shelf or in a sealed enclosure. Allow for proper clearance above
the equipment.
A
I
0
The exclamation point within an equilateral
triangle is intended to alert the user of the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
WATER AND MOISTURE
7.
The equipment should not be used in or around water, such as a bathtub, sink, or swimming area. Also, the equipment
should not be used in areas prone to flooding, such as a basement.
POWER SOURCES
8.
The equipment should be connected only to a power source of the same voltage and frequency as that listed on the
rear panel above the power cord entry point.
9.
POWER CORD PROTECTION
Power cords should be arranged so that they do not interfere with the movement of objects in the room: people, fan
blades, utility carts, etc. Also, care should be taken that the cord is not pinched or cut, and placed so that it is not in
danger of being pinched or cut, as in under a rug, around a tight corner, etc.
10. POWER CORD GROUNDING
The power supply cord is of a three wire grounded type, designed to reduce the risk of electric shock sustained from
a live cabinet. It is assumed to be of suitable length for most uses of the equipment. The use of extension cords and
power strips is discouraged unless they are of suitable rating to deliver the required total current for safe operation of
all connected equipment. Furthermore, extension cords or power strips must provide the same three wire grounded
connection. It is important that the blades of the equipment’s plug be able to fully insert into the mating receptacle.
Never remove the round grounding pin on the plug in an attempt to mate to a two wire ungrounded receptacle: use
a grounding adaptor with the grounding tab or wire suitably connected to earth ground.
-l-
11. NON-USE PERIODS
-2-
During periods of extended non-use, the power cord should be unplugged from the power source.
12. CLEANING
The equipment should be cleaned only as detailed in the operating instructions.
13. OBJECT AND LIQUID ENTRY
Care should be taken so that objects and/or liquids, such as cleaning fluids or beverages, are not spilled into the
enclosure of the equipment.
14. DAMAGE REQUIRING SERVICE
Hafler equipment should be serviced by qualified service personnel when:
A. The power supply cord or plug has been damaged, or
Objects have fallen, or liquid has been spilled into the equipment, or
B.
C. The equipment has been exposed to rain, or
D.
The equipment does not appear to operate normally or exhibits a marked change in performance, or
E.
The equipment has been dropped, or the enclosure has been damaged.
15. SERVICING
The user should not attempt to service the equipment beyond that which is described in the operating instructions. All
other service should be referred to qualified service personnel.
16. CARTS AND STANDS
The equipment should be used with carts or stands only of sufficient strength and stability for the use intended.
An equipment and cart combination should be moved with care. Quick stops and starts, excessive force, and
uneven surfaces may cause the equipment and cart combination to topple.
TABLE OF CONTENTS
PERFORMANCE SPECIFICATIONS
............................................................................................
General Information ...............................................................................................................
INSTALLATION
Rackmounting ........................................................................................................................
Ventilation/Placement ............................................................................................................
Line Voltage ...........................................................................................................................
OPERATION/CONNECTIONS
Power Cord Connection
Initial Power-Up/Muting
Convenience Outlets
........................................................................................................
System ............................................................................................
.............................................................................................................
Line Level Inputs ...................................................................................................................
Phono Section .......................................................................................................................
Front Panel View Diagram .....................................................................................................
Rear Panel View Diagram
Input/Record Output .....................................................................................................
Tape
Controls/Tone Switch ...................................................................................................
Tone
1,
Out
Control
Control
......................................................................................................................
.....................................................................................................................
2,
And Output Switch .........................................................................................
Output ..............................................................................................................
Section
Level
......................................................................................................................
Inpu?
Selector System
Buffer And Record Output Driver.. ............................................................................
Monitor Switching
And Balance Controls..
.....................................................................................................................
Control System
System .....................................................................................................................
.......................................................................................................................
Amplifier ...........................................................................................................
Volume
Balance
Out
Headphone
CIRCUIT DESCRIPTION
Phono
Line
J-FET
Tape
Volume
Line Amplifier..
Tone
Muting
Power Supply
Headphone
.....................................................................................................
.........................................................................................
........................................................................................................
............................................................................................
............................................................................................................
4
5
5
5
5
5
5
6
6
6
7
8
9
9
9
9
10
10
10
10
11
11
11
11
11
11
11
12
ADDITIONAL INFORMATION
Installing
Phono
Installing
Changing
Cartridge
Phono Option .......................................................................................................
Board Installation Diagram .......................................................................................
Cartridge Loads ....................................................................................................
Line Voltage Rating .............................................................................................
Loads Installation Diagram ..................................................................................
General Troubleshooting Hints ............................................................................................
Ground Loops
......................................................................................................................
Cleaning/Maintenance .........................................................................................................
Functional
Block Diagram ....................................................................................................
Main Board Parts List ..........................................................................................................
Main Board Component Layout Diagram
Main Board Circuit Schematic Diagram
............................................................................
...............................................................................
Phono Board Parts List ........................................................................................................
Phono Board Component Layout Diagram
..........................................................................
Phono Board Circuit Schematic Diagram ............................................................................
SERVICE POLICY AND LIMITED WARRANTY
.........................................................................
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.12
.13
.14
.14
.15
.16
.17
.17
.18
.19
.20
.21
.22
.23
.24
.25
PERFORMANCE SPECIFICATIONS
PHONO SECTION
(Measured At
REC OUT)
All specifications are for 20 Hz - 20
FREQUENCY RESPONSE: +/-0.1
MAXIMUM OUTPUT: 5 volts RMS
TOTAL HARMONIC DISTORTION AND NOISE:
Moving Magnet:
Moving Coil:
SENSITIVITY (For 0.5 volts RMS at REC OUT, @ 1 kHz):
Moving Magnet: 6.0 mV RMS
Moving Coil: 600 uV RMS
SIGNAL TO NOISE RATIO (A-weighted, relative to 0.5 V RMS at REC OUT):
Moving Magnet: -87
Moving Coil: -80
MAXIMUM INPUT SIGNAL (@ 1
Moving Magnet: 65 mV RMS
Moving Coil: 6.5 mV RMS
INPUT IMPEDANCE:
Nominal: 47,000 ohms
Moving Magnet: 220 pF as supplied, user adjustable
Moving Coil: 100 ohms as supplied, user adjustable
.002%
.009%
dB
dB
dB
kHz):
kHz
unless specified otherwise.
LINE AMPLIFIER
(Measured at
OUT 1
or OUT 2)
HEADPHONE
AMPLIFIER
GAIN (@ 1
Moving Magnet: +38.5
Moving Coil: +58.5
FREQUENCY RESPONSE: +/- 0.1 dB (into 33,000 ohms)
BANDWIDTH: 8 Hz
MAXIMUM OUTPUT: 6 volts RMS
TOTAL HARMONIC DISTORTION AND NOISE:
SENSITIVITY (For 0.5 volts RMS Output): 45 mV RMS
SIGNAL TO NOISE RATIO (A-Weighted, relative to 2 volts RMS output): -100
INPUT IMPEDANCE: 20k ohms (including
OUTPUT IMPEDANCE: 316 ohms
TONE CONTROLS> Bass: +/- 16
MAXIMUM OUTPUT: 4 volts RMS into 150 ohm load
OUTPUT IMPEDANCE: 150 ohms
kHz):
dB
dB
-
170 kHz, -3 dB, into
Treble: +/- 14
10k
ohm load
.008% @
PHONO/AUX1
dB
@ 20 Hz, moving inflection, variable turnover
dB @
20 kHz, shelving @ 5 kHz, fixed turnover
2 volts RMS
dB
when phono option not installed)
-4-
GENERALjINPUTS: Tuner, Video, CD, Phono/Aux 1, Aux 2, Tape Monitor
IEC Type 320, 3-wire, 18 gauge
INFORMATION
INSTALLATION
OUTPUTS: Out 1, Out 2, Record Out, Headphone
CONTROLS: input Selector, Volume, Tape Monitor , Tone Control In, Balance, Bass, Treble,
Output Off, Power, Phono MM/MC
INDICATORS: Mute/Standby, Power
CONVENIENCE OUTLETS: 1 Unswitched, 4 Switched (Polarized)
(Convenience Outlets are not included on 200-240 VAC units)
PHYSICAL DIMENSIONS:
17”
(W) x 7-5/8” (D) x
43.2cm (W) x 19.4cm (D) x 4.5cm (H) (excluding feet); Faceplate 43.2cm or
POWER CONSUMPTION (Excluding Convenience Outlets): 9 watts Max.
AC LINE VOLTAGE OPERATING RANGE: (exceeding lower limit will activate muting circuit;
exceeding upper limit will result in overheating and/or component damage)
100
-
120 Volt 50/80 Hz Models: 85 - 130 volts
200
-
240 Volt 50/80 Hz Models: 170 - 280 volts
l-3/4”
(H) (excluding feet); Faceplate 17” or 19” (W).
483cm
(W).
RACKMOUNTING
VENTllATlON/
PLACEMENT
LINE VOLTAGE
The 915 Preamplifier is supplied in either a 17” Black Version, or a 19” Silver Version. The 19
model has rackmounting holes provided for installation in equipment racks. The holes are on
standard EIA spacings.
The 915 produces very little heat during operation, and therefore requires no special considerations for ventilation. The preamplifier should be located at least several inches away from
components that contain large power transformers (such as power amplifiers), due to the
possibility of audible hum or buzz from magnetic radiation.
The 915 Preamplifier is configurable for either 100
is accomplished by changing internal jumpers on the printed circuit board. The procedure is
detailed in the section “CHANGING LINE VOLTAGE RATING”. Make sure that the unit is
configured for your local AC line voltage before attempted use. The configuration is labelled
directly above the power cord connector.
OPERATION/CONNECTIONS
POWER CORD
CONNECTION
Units wired for200-240 VACare supplied without power cords. Local agents will supply cords with
male connectors appropriate to the local standard.
Units wired for
connector plugs into the receptacle provided on the rear panel. This power cord is a standard
IEC Type 320, 3-wire, 18 gauge assembly. Should replacement ever be necessary, be sure to
replace it with an identical cord.
100-120
-
120 volt, or 200 - 240 volt operation. This
VAC are supplied with a detachable AC power cord. The female
Never remove the grounding pin from the male end of the cord.
wall outlet is not available, a ground adaptor should be employed, with the ground tab or wire of
the adaptor connected to a suitable earth ground.
INITIAL POWER-
UP/MUTING
SYSTEM
For units wired for 200-240 VAC, the front panel Power Switch controls the power to the
Preamplifier’s circuitry. If desired, this switch may be left “on” at all times to allow circuits to be
thermally stabilized for maximum fidelity as soon as the system is used.
In applications where a grounded
-5-
For units wired for
-6-
100-
120 VAC, the Power Switch controls the Switched Convenience Outlets only.
As soon as the 915 is plugged into the AC line, power is applied to the circuitry (regardless of the
position of the front panel Power Switch). Therefore, all connections should be performed with the unit
unplugged.
For all units, when power is applied, the Ready Light will glow red for several seconds, indicating that
the Audio and Headphone Outputs are muted. Once the delay period has passed and the power
supply has stabilized, the light will turn green. The preamplifier is now ready to enjoy.
The muting will reactivate immediately (and the Ready Light turn red) upon loss of AC line voltage,
(or operating the Power Switch on 200-240 VAC units), or if line voltage falls below a level which
precludes proper operation of the preamplifier’s circuitry.
CONVENIENCE
OUTLETS
Safety requirements.
The remaining four Switched Outlets are powered when the front panel Power Switch is engaged, as
indicated by the switch’s green pilot light.
The maximum power available from these outlets is 1200 watts total. This total power may be drawn
from a single outlet, or a combination of outlets. Since some power amplifiers consume more than
convenience outlets.
LINE LEVEL
INPUTS
The inputs labelled CD, Tuner, Video, Aux 2, and Phono/Aux 1 (when the Phono Option is not
installed), are identical line level inputs. The names chosen for these inputs are for convenience only,
and may be used interchangeably, or for any other type of line level source. These inputs are selected
via the rotary front panel Selector Switch.
The Phono/Aux 1 input is converted from a line level input to a high gain RIAA phono input when the
The 915 Preamplifier is available with an optional Phono Amplifier section. This option may be
will be filled by a plastic cover.
Units wired for 200-240 VAC are supplied without convenience outlets to conform to Regulatory
700-
Units wired for
720 VAC have a total of five outlets for connection of associated components. The
Unswitched Outlet is powered at all times, which should generally be used for a turntable or tape deck.
1200 watts at maximum output, check the power amplifier’s rating before connecting to these
Phono Option is installed. See Phono Section.
installed at time of purchase, or at a later date. Inclusion of this option is indicated by the presence
of a switch button protruding from the rear panel opening marked MC/MM. Otherwise, this opening
PHONO SECTION
(When Installed)
-
The MC/MM switch should be set to MC for low output (typically 0.2
-
and set to MM for high output (2
5 mV) moving coil cartridges or moving magnet cartridges.
0.5 mV) moving coil cartridges,
NEVER OPERATE THE MC/MM SWITCH UNLESS THE VOLUME CONTROL IS TURNED FULLY
DOWN. The very high gain present in the Phono Amplifier can result in switching transients capable
of blowing amplifier or speaker fuses, and possibly damaging some loudspeakers.
The ground terminal near the MC/MM switch is provided for turntable frame grounding via the extra
ground wire provided on most turntables.
As supplied from the factory, the phono cartridge input termination is 47,000 ohms in parallel with 220
pF
in the Moving Magnet mode, and 100 ohms in the Moving Coil mode. The value of capacitance
and resistance is user selectable via plug-in components. See “Installing Cartridge Loads” for further
information and instructions.
INPUT SELECTOR
0
VOLUME CONTROL BASS CONTROL
BALANCE CONTROL TREBLE CONTROL
HEADPHONE JACK
POWER SWITCH
UP TO TURN ON
SWITCHED OUTLETS*
I
-l
I
0
.
RACKMOUNT HOLES
(19”
VERSION ONLY)
w
TAPE MONITOR SWITCH
UP TO MONITOR TAPE INPUT UP TO ACTIVATE BASS & TREBLE UP TO TURN OFF RED FOR MUTE ACTIVATED
TONE IN SWITCH OUTPUT OFF SWITCH READY LIGHT
OUT1 &OUT2
GREEN FOR OPERATE
A
CJ
915 PREAMPLIFIER FRONT PANEL VIEW
*lOO-120
200-240 VAC UNITS ARE WITHOUT CONVENIENCE OUTLETS:
POWER SWITCH CONTROLS PREAMPLIFIER POWER.
VAC UNITS ONLY.
0
GROUND
PHONO CHASSIS
1
PHONO/AUX
TUNER
VIDEO CD
AUX 2
TAPE
REC OUT
OUT 2
1
OUT
MOVING MAGNET
-
MC/MM SWITCH
IN-MOVING COIL
(PHONO OPTION ONLY)
OUT
INPUTS
LEFT CHANNEL
-
RIGHT CHANNEL
-
BOTTOM ROW
TOP ROW
OUTPUTS
20 VAC UNITS ONLY.
*100-l
OUTLET*
UNSWITCHED
RATING
AC LINE VOLTAGE
SWITCHED OUTLETS
LINE CORD CONNECTOR
200-240 VAC UNITS ARE WITHOUT CONVENIENCE OUTLETS.
915 PREAMPLIFIER REAR PANEL VIEW
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