2bsst owner`s manual

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BHA-1
OWNER’S MANUAL
IMPORTANT SAFETY INSTRUCTIONS
The lightning flash with arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of un-insulated
“dangerous voltage “ within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the product.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with dry cloth.
Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A
grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used use
caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such
as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been dropped.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR SPLASHING AND ENSURE THAT NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, ARE
PLACED ON THE EQUIPMENT.
TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC MAINS, DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC
RECEPTACLE.
THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE.
BRYSTON LIMITED WARRANTY
Bryston analog audio products are warranted to be free from manufacturing defects for twenty (20) years from the original date of manufacture. The
warranty includes parts and labour.
Bryston Digital products and cables are warranted for five years from the original date of manufacture. The warranty includes parts and labour.
Bryston products having motorized moving parts, excluding motorized volume controls, are warranted for three years from the original date of manufacture. The warranty includes parts and labour.
Bryston will remedy the problem by repair or replacement, as we deem necessary, to restore the product to full performance. Bryston will pay return
shipping costs for the full length of the specific product’s warranty.
In the event of a defect or malfunction, contact Bryston’s repair centers for return authorization. Products must be returned using original packaging
material only. Packing material may be purchased from Bryston if necessary. This warranty is considered void if the defect, malfunction or failure of the
product or any component part was caused by damage (not resulting from a defect or malfunction) or abuse while in the possession of the customer.
Tampering by persons other than factory authorized service personnel or failure to fully comply with Bryston operating instructions voids the warranty.
This warranty gives you specific legal rights and you may also have other rights which may vary from province to province and country to country.
As of 2006-02-22 Bryston will only warranty Bryston products purchased through authorized Bryston dealers. Bryston products with a date code
of 0608 or higher (date code format is “yyww”, where “yy” is the two least significant digits of the year and “ww” is the week of the year) must be
accompanied by a copy of the bill-of-sale from a Bryston authorized dealer to qualify for warranty service. The warranty is transferable from the original
owner to a subsequent owner as long as a copy of the bill-of-sale from the original authorized Bryston dealer accompanies the re-sale. The copy of the
bill of sale to any subsequent owner need ONLY include the Name of the Bryston Authorized Dealer and the Model and Serial number of the Bryston
product The warranty will only be honored in the country of the original purchase unless otherwise pre-authorized by Bryston.
BRYSTON SERVICE in CANADA:
BRYSTON SERVICE in the USA:
BRYSTON SERVICE outside Canada and the USA:
Postal address: P.O. BOX 2170, Stn. Main
PETERBOROUGH, ONTARIO
CANADA K9J 7Y4
Courier address: 677 NEAL DRIVE
PETERBOROUGH, ONTARIO
CANADA K9J 6X7
79 COVENTRY ST., Suite 5
NEWPORT, VERMONT
U.S.A. 05855-2100
contact your local distributor or
PHONE:705-742-5325
FAX:705-742-0882
E-mail:cdnser@bryston.com
PHONE:802-334-1201
FAX: 802-334-6658
E-mail:usaser@bryston.com
CHECK OUR WEB SITE:
E-MAIL BRYSTON DIRECTLY:
FAX BRYSTON DIRECTLY:
PHONE BRYSTON DIRECTLY:
www.bryston.com
cdnser@bryston.com
01-705-742-0882
01-705-742-5325
BHA-1 HEADPHONE AMPLIFIER
TABLE of CONTENTS
Safety Instructions, Warranty and Contact Information ............Opposite
General Information.................................................................. Page 1
Introduction
General Description
Installation & Setup
Power Conditioners
XLR Connector Options
Fuses
Technical Specifications................................................................ Page 2
Driving Multiple Pairs of Headphones
Front Panel Legends..................................................................... Page 3
Input Select Switch
Gain Select Switch
Volume Control
Balance Control
Balanced Outputs
Single Ended Output................................................................ Page 4
Status LED................................................................................
Power Switch
Rear Panel Legends
Power Inlet
Fuse Drawer
Fuse Label & Warnings.............................................................. Page 5
Remote Trigger Connector
Mini Jack Input
Single-Ended Inputs
Balanced Inputs
Data Plate
Wiring Headphones for Balanced Operation
Using the BHA-1 with an MPS-2 External PSU............................ Page 6
Remote Trigger (Power On/Off) Control
Exterior Dimensions .................................................................... Page 7
BHA-1 model codes ..................................................................... Back Page
INTRODUCTION:
Thank you for choosing the Bryston BHA-1 Head
Phone Amplifier. We welcome any suggestions
you may have, or comments regarding the operation of your amplifier. We consider you, our customer, to be Bryston’s’ most important resource,
and your opinion is very much appreciated. No
warranty card is necessary to initiate your coverage. Refer to the back page for detailed warranty
information. Please save the original box and all
packing materials. Always use the original packing materials when shipping or moving the BHA-1.
GENERAL DESCRIPTION:
The BHA-1 is a stereo headphone amplifier that
features:
● Balanced dual mono circuitry
●High quality laser trimmed Noble stereo
Volume control
● Left/Right balance control
●6 fully discrete class A Bryston operational amplifiers
●Balanced outputs: 4 pin stereo and dual
left/right 3 pin outputs
● Stereo ¼ inch single ended outputs
● 14dB or 20dB of selectable gain available
●All input and output connectors are Gold
plated
● 10k input impedance
● Multiple headphone drive capability ●Power supply options:
Standard:high quality Bryston internal analog power supply
Optional:External MPS-2 power
supply (replaces internal
supply)
INSTALLATION & SETUP:
Check the label next to the power input connector on the rear of the BHA-1 and verify
your amplifier complies to your local A/C voltage and frequency requirements.
The BHA-1 is a convection cooled amplifier. The
entire enclosure, and the aluminum top in particular, acts as a large surround heat sink helping to
transfer heat to the surrounding air. Therefore the
BHA-1 installation should allow for unrestricted
air flow around it. We recommend maintaining at least 3 inches of clear space to the sides
and top of the amplifier. The BHA-1 should not
be installed near other heat sources like heating vents or radiators. The BHA-1 should not be
installed in tight enclosed areas.
Bryston recommends that at least 6 inches of
space be provided to the rear of the amplifier for
properly dressing input, output and power cables.
POWER CONDITIONERS:
Bryston urges caution in choosing a power
conditioner for your audio/video system. Large
power amplifiers can draw very substantial
current from the wall plug, and many so-called
power conditioners can in fact hinder the supply
of current by inserting resistances in series with
the line cord. However, there are now power
conditioners that can reduce or eliminate RF
and ‘hash’ from the AC supply and may actually improve current delivery to your system.
This type of power conditioner (exemplified by
Bryston B.I.T. Power Conditioners) uses the
energy storage in a large toroidal transformer to
provide high instantaneous power and reduce
the substantial AC output resistance of the wall
socket and house wiring. This resistance can
be in the range of 0.5 to 1 Ohm and is typically
reduced to only a few milli-ohms by the Power
Conditioner. That in turn considerably reduces
Voltage drop in the power line on high current
surges and quite substantially increases the
stability of the power line improving audio (and
video) focus, precision and clarity.
XLR CONNECTOR OPTIONS:
Although the pictures and illustrations in this
manual show all female non-locking connectors, all XLR connectors are available with locking mechanisms on a special order basis. Also,
the XLR output connectors on the front panel
are available in either gender (male or female).
FUSE:
The BHA-1 has a single, fast acting 5x20mm
tubular glass fuse, located in a locking drawer
that is integrated into the power inlet (see pg’s
6 & 7). Turn off the unit and remove the power
cord before attempting to remove and replace
the fuse. Replace fuse with the type and value
stated on the fuse label. In the event of a
descrepency, follow the data on the fuse label.
For 100-120VAC models: F 2A/250V
For 200-240VAC models: F 1A/250V
BHA-1 HEADPHONE AMPLIFIER
BHA-1 SPECIFICATIONS
Power Output:
Maximum:
Nominal:
Input Impedance:
10K ohms single ended (unbalanced)
+15K/-5K ohms double ended (balanced)
Sensitivity:
20
14
20
14
dB
dB
dB
dB
setting:
setting
setting:
setting
6 Watts per channel into 32 Oms
500 milliwatts per channel into 50 Ohms
0.707 Volts in = 1.0 Watts into 50 ohms
1.411 Volts in = 1.0 Watts into 50 ohms
0.500 Volts in = 500 mW into 50 ohms
0.998 Volts in = 500 mW into 50 ohms
Distortion: THD+noise:
< 0.005% 20 Hz to 20 kHz
IMD: < 0.001% 60 Hz + 7 kHz mixed 4:1
Noise:
Measured with input shorted (20 Hz to 20 kHz.)
>103 dBv (with 20 Hz to 22 kHz band pass filter)
Frequency Response: 20 Hz to 20 kHz @ ± 0.1 dB.
Power Bandwidth: <1 Hz to over 100 kHz
Power consumption: 50 Watts
Heat load: 130 BTU/hr
Dimensions: Maximum overall dimensions with C-series front panel & feet:
17” dress panel: 2.713” high & 11.1” deep (432mm • 69mm • 282mm)
19” dress panel: 2.713” high & 11.1” deep (483mm • 69mm • 282mm)
Maximum overall dimensions with Rack mount panel & feet:
19” wide, 2.45” high & 11.1” deep (483mm • 62.2mm • 282mm)
Maximum overall dimensions with Rack mount panel but without feet:
19” wide, 2.45” high & 11.1” deep (483mm • 62.2mm • 282mm
(See page 8 for more details)
Weight: unit alone:
11.7 lbs (5.3 kg) approx.
with packaging 16.5 lbs (7.5kg) approx.
DRIVING MULTIPLE PAIRS OF HEADPHONES
While the BHA-1 is capable of driving multiple pairs of headphones from its three outputs (single 4
pin XLR jack, dual 3 pin XLR jacks and 1/4” stereo phone jack) the resultant load impedance should
always be greater than 32 Ohms. Note that the three outputs are all in parallel and are all driven from
the same output amplifiers.
To calculate the load of two and three pairs of headphones being driven simultaneously:
Where A is the load of the 1st pair of headphones in Ohms, B is the load of the 2nd pair and C is the
load of the 3rd pair of headphones:
Load of 2 parallel headphones = 1/((1/A)+(1/B))
Load of 3 parallel headphones = 1/((1/A)+(1/B)+(1/C))
BHA-1 REAR & FRONT PANEL LEGENDS
FRONT PANEL
1: INPUT SELECT SWITCH
Select between Balanced (XLR 3 pin female),
RCA (unbalanced or single-ended) and MINI
(3.5mm TRS or 3 conductor mini Phone jack)
2: GAIN SELECT SWITCH
Select between 14 decibels (gain = 5) or 20
decibels (gain = 10)
3: VOLUME CONTROL
4: BALANCE CONTROL
With centre detent.
5: BALANCED OUTPUTS Using two 3 pin XLR jacks, one for the left
channel output and another for the right chan-
nel output. Pin 1 is ground, pin 2 is the positive phase and pin 3 is the negative phase.
See page 5 and 6 for more wiring details.
6: BALANCED OUTPUT (4 PIN XLR)
This 4 pin XLR jack is wired in parallel to the
dual 3 pin XLR jacks (see above), therefore
do not use both the dual 3 pin XLR’s and the
single 4 pin XLR output at the same time.
Pin 1 = Left +
Pin 3 = Right +
Pin 2 = Left –
Pin 4 = Right –
BHA-1 HEADPHONE AMPLIFIER
7: SINGLE ENDED OUTPUT
Quarter inch stereo phone jack, also referred
to as a ¼ inch TRS (Tip-Ring-Sleeve) connector, or a 3 conductor ¼ inch phone jack. This
single ended or unbalanced output uses only
one of two output stages and therefore delivers only half the available power.
TIP = Left channel
RING = Right channel,
SLEEVE = ground (or common)
8: STATUS LED
Lights green when the BHA-1 is turned ON.
When the BHA-1 with the external power supply option is properly connected to an MPS-2
external power supply and the MPS-2 is turned
ON but the BHA-1 is turned OFF, the LED will
light red to indicate that external power is available.
9: POWER SWITCH
The UP position is ON and the DOWN position
is OFF. There is no standby mode in the BHA1. However, when the power switch is OFF it is
still possible to turn the unit on via the Remote
Trigger Input on the rear panel (se Rear Panel,
item 11 and also Remote Turn On on page 5).
REAR PANEL
10: IEC 60320-C14 POWER INLET
Mates with C13 power cord connector.
11:FUSE DRAWER
Turn off unit and disconnect power cord before attempting to replace the fuse. Replace
the fuse only with the same type and value as
stated on the fuse label on the rear panel next
to the fuse drawer/power inlet module.
12:FUSE LABEL & WARNINGS.
Follow all warnings and cautions.
13: REMOTE TRIGGER INPUT
When the power switch (item #9) is turned
off (down) the unit can still be powered on
by applying 12 volts DC at 50mA, across the
two TRIGGER INPUT pins. A two position
mating screw terminal connector (Bryston
part number CO-110A-11102) is included
with each unit. (see next page for hookup
details)
14:STEREO MINI-JACK INPUT
A 3.5mm 3 conductor gold plated phone
jack for connecting any audio analog audio
source like MP3 players, etc. Corresponds
to the “MINI” position of the input selector
switch (item #1).
15: SINGLE ENDED INPUTS
One pair of RCA jacks, gold plated, for connecting line level analog audio inputs
16: BALANCED INPUTS
3 pin female XLR jacks, gold plated, for
connecting balanced analog audio input
signals the BHA-1.
Pin 1 = ground
Pin 2 = positive phase
Pin 3 = negative phase
17: DATA PLATE LABEL
Lists the model name, electrical ratings, serial number, manufacturing date code (yyww,
where the first two digits represent the two
least significant digits of the year, and the last
two digits represent the week of the year).
WIRING HEADPHONES FOR BALANCED OPERATION
For headphones that have a separate pair of wires (+ and - phase) from each side, maximum performance can be obtained by wiring these headphones for fully balanced operation where there is no
common or shared ground.
The BHA-1 provides two different connector options for balanced operation:
1)Using a single 4 pin XLR connector (e.g. Neutrik NC4MC-B), the left driver is connected as
follows:
LEFT+pin 1 RIGHT+pin 3
LEFT–pin 2
RIGHT–pin 4
2)Using two 3 pin XLR plugs (e.g. Neutrik NC3MX-B) wire the two connectors as follows:
LEFT connector +pin 2
RIGHT connector +pin 2
LEFT connector –pin 3 RIGHT connector –pin 3
BHA-1 HEADPHONE AMPLIFIER
CONNECTING THE BHA1...EXT HEADPHONE AMPLIFIER
to the
MPS-2 POWER SUPPLY
The BHA-1 is available without an internal power supply. These models require a Bryston MPS-2 external power supply and an interconnecting cable as shown below. The required cable assembly is with
the MPS-2.
When the MPS-2 is properly connected to the BHA-1 and the MPS-2 is turned on but the BHA-1 is
turned off, the BHA-1’s front panel status indicator LED will light red. This indicates that power is available to the BHA-1. Once the BHA-1 is turned on, either by the front panel On/Off switch or remotely by
via the Remote Trigger connection, the LED will light green.
REMOTE TRIGGER HOOKUP
When the front panel power switch (item #9) is turned off (down) the unit can still be powered on by applying 12 volts DC at 50mA, across the two TRIGGER INPUT pins. Because the Remote Trigger Input
is rectified and regulated the polarity of the this input voltage doesn’t matter. The Trigger voltage can
be supplied form Bryston’s MPS-2 External Power Supply, from another piece of Bryston equipment
with remote trigger capability or from another source. A two position mating screw terminal connector
(Bryston part number CO-110A-11102) is included with each unit. Do not over tighten the terminal set
screws as this can actually cause the connection to loosen over time. Maximum torque is 4.5 inchpounds (0.5Nm). Stranded copper wire between 24 and 18 AWG is recommended. Strip 1/4” of insulation off the end of the wires to be connected to the CO-110A-11102. The wire ends should be bare
copper; not tinned.
REMOTE TRIGGER
INPUT (BHA-1)
REMOTE TRIGGER
OUTPUT (MPS-2)
The Remote trigger input is non-polarized so
either output wire can go to either input pin.
Tighten wires with no more than 0.5Nm torque
BHA-1 OVERALL SCHEMATIC
-20B
LOGO
H1
B
H2
H3
H5
H6
H7
H9
47p
100R
MJD243
MJD243
3
2
10K0
1
OUT L
RL5B 6CM
G
6C11
6R19
6
6
5
4
3
3C11
100N
3R19
100R
-VA
BRN
2RD
2P3
1
2
3
RED
WHT
2RE
GRY
BLU
BLK
RED
G2
2CA
PCB2
PCB BHA1 TX AC SEL R5
2CE
10N
JFSN
2CG
L
N
AC
2CL
2CP
2200u
+
2CM
2200u
33V+
10N
10N
12V+
2BR2
2RH
+
2CH
+
10N
2CK
E
R
B
100K
6RL G6
ON LED
6P2
JFS4
6
B
M
GLD
G6
CB
+
CC
CE
+
150R
47p
5C1
47u
100N
5C6
5C7
2200u
1K5
+
DR4
+VA
100N
47p
5C8
5C5
BAL
RCA
MINI
2SIN
7
6
6
5
5
4
4
3
3
2
2
1
1
22u
C15
2200u
+
MJD243
MJD243
5R14
5R11
5R13
5R11
5R15
5R11
5R20
5R21
10R0
10R0
G
10K0
+
4700u
5C11
100N
5R9
5RM
G
G
5R19
100R
2200u
CG
CR9
22u
+
GNYL WIRE
PG
CJ
CH
+
4P2
RLP2C
RLP1C
+
100R
RG
CR10
22u
+
D8
RLP2B
chassis
12V4
RLP1B
D
CK + CL + CM
2200u
MJE15030
ON4
BR3
+VB
4RB
RLP2A
ON LED
R
S1G
GL
PCB BHA1 MPS2 PS R5
S1G
D2
RL7C
S1G
RL5C
S1G
MPS2 VERSION USE PCB 3 + 4 ONLY
RL6C
PCB3
S1G
QF1
100K
2ZM
9J MPS2
100R
+ CF3
22u
5.1V
PWRUP MUTE
RELAYS SUPPLY
254PW07E
5
4
6
3
2
1
1K0
3RE
3P1
12V
5
1
Q2
Title :
4
5
BHP1 - HEADPHONES AMPLIFIER
BHA1 OVERALL
Date :
MAR 2012
6
Sheet : 1 of
7
Drawn : ST
E
RA2
4K99
4K99
RA4
Q1
P.O. BOX 2170, 677 NEAL DR. PETERBOROUGH, ON. CANADA K9J 7Y4
PHONE (705) 742-5325
FAX (705) 742-0882 WWW.BRYSTON.CA
File :
3P2
LDA210S
1K0
RA3
LTD
ON
3IC1
3
RA1
1K0
PCB6
PCB BHA1 AC PSW R5
B
RLP1A
RL2C
D9
R1
PCB4
SW PRB
SW PRA
-VB
SW PWRA
3
C
5CM
470p
+
5C15
RL1C
D7
R2
G
MJD253
5Q6
100
CHAS
2
MJD253
5Q8
200
S1G
D1
+12V
4CR
8J1
RL5A
5Q12
GND ISO
3_B
-
OUT L
-VA
CR12
100N
QR4
+
5P6
7
D3
3_A
AC
4BR1
+33A
RL3C
2_A
14dB
2
J8T
7R9
5R11
M2
PCB BHA1 AC IN R5
1
5R12
5R11
5R11
499R
5R10
5C3
1K0
5Q10
5C4
CR11
100N
DR3
CF
+
MJE15030
2_B
B
J8R
MJE15031
+
20dB
8J3
1
J8S
7R10
5R11
G
5OUT
6.8p
+
QR3
RR3
-VA
G
+
CD
INPUTS
FJ1
REA
JFSG
QR2
2SG
5J7
100N
+
SW PWRB
WIRES
CHAS
fuse
6P3
EXT
1J1
CR2
22u
REC
7
6P1
+
100N
CR3
GAIN
2CJ
AC
REB
CR1
22u
+
12V EXT PWR UP
JFS3
+
DR2
A/C VERSION USE PCB1,2 AND 6 ONLY
PCB1
1K5
CA
DR1
+33A
10N
JFSL
2200u
ON5
2QA
15V+
+
AC
2CF
2BR1
+
2CB
10N
+
4
3
5Q11
ac
R2
VIO
2RC
33V-
5R6
10K0
5R4
34K8
47u
5C9
OPAMPS SUPPLIES
100N
3
2
L+A
7J4
5Q9
-
R1
5P4
L-A
G
RR4
V2
5Q7
100
5D3
5C14
100p
MJE15031
CR4
RR2
1K5
V1
1K5
100V
VIO
2P4
-
120V
ORN
YEL
2RB
200
5Q5
5D2
1K5
QR1
RR1
10N
AC
100/120
D
2P1
2RA
2CC
AC
120/240
100/220
2P2
TF1
-
220/240
10N
R+A
G
5D1
100N
5R2
34K8
5Q4
200
-33A
2CD
6.8p
5Q2
100
BAL OUT
R-A
1
100N
-20E
-33A
2RF
100p
1K0
5RB
G
-20C
5C2
5Q1
100
8R7A
8R6A
8R5A
8R4A
8R3A
8R1A
8R2A
G8A
5C10
5R8
ac
+
3RM
1
1
8J2
PCB BHA1 MALE R5
5C13
5Q3
200
G
+
150R
5R1
2K61
3R15
5R11
MJD253
1K0
47p
G
3R9
100R
5R18
2
2
G
5R7
10K0
MJD243
MJD243
3R11
499R
3R12
5R11
3R14
5R11
47p
6.8p
3R10
100N
3R7
10K0
34K8
3R13
5R11
MJD253
3C15
4700u
+
150R
3CH
RL3B
3C5
FIDUCIAL
100N
FIDUCIAL
RL6A
3Q10 3Q12
3Q6
100
3C8
FIDUCIAL
3C4
47u
FIDUCIAL
3D3
3Q8
200
6.8p
+
3C9
FU4
G
3OUT
G
3R3
2K61
FU3
-20A
G
3Q9 3Q11
3D2
3R4
100p
3C14
47p
FU2
3RH
20K0
FU1
3D1
3C3
3Q4
200
+20E
3C10
100N
3Q7
100
3C2
3R6
10K0
3R2
34K8
3Q3
200
150R
3C1
47u
3C6
100N
100p
3CE
3R17
10R0
3RF
1R11
100R
150R
1R6
47p
1C5
+
3R1
2K61
100K
3RA
1K0
LEFT
BAL
1R8
68R1
1Q6
100 -VA
1C9
1C8
47u
100N
1R3
2K61
R4L
4K99
5J2
R10L
1Q8
200
G
3Q2
100
4K75
100p
3CF
1R4
34K8
1C4
6.8p
47p
RL7B
3Q1
100
2K0
1D3
C3L
R5L
4K99
C
100N
1Q2
100
1Q4
200
3CA
270p
1R9
68R1
R3L
1Q1
100
1Q3
200
1C3
1D1
49R9
4K99
1R10
100R
47u
1C7
G
1R7
150R
C1L
270p
R2L
1C1
47p
1R5
150R
100N
1C6
1R1
2K61
47p
5J1
G
100
100R
5R11
5R11
5R11
5R11
5R11
5R11
5R11
5R11
7
7
OUT R
2
8R8A
8
8
+VA
3R8
3Q5
200
100p
3C13
1Q7
1D2
49R9
RL1A
200
6.8p
1C2
+20C
+
G
VRBB
+VA
1Q5
R6L
4K99
G
1R2
34K8
R1L
4K99
R7L
RL1B
+
C4L
4K99
R8L
VRB
3C7
R9L
100R
+20A
2
G8A
9
9
-VB
+VA
3R18
A
+
1560-OD
270p
1560-OD
5CA
1560-OD
5R3
2K61
1560-OB
5RA
1K0
5CE
100p
1560-OB
5R17
10R0
1560-OB
5RF
1K0
100p
5CF
1560-OB
7J3
1
3
8P1
5J6
100N
4
3
PCB8
4
3R21
10R0
10R0
3R20
3CM 470p
1560-OB
1
1
-20F
10K0
1560-OB
L+
470p
G
6R9
3
2
L-
CONNECTOR OPTION
3
1560-OB
R+
7J1
4700u
5
5J3
BAL OUT
R-
G8
6C15
+
6R15
5R11
6Q10 6Q12
100R
-VB
4
+
47p
6C8
100N
5
6R21
10R0
6R20
10R0
6Q8
200
6Q6
100
6C5
47u
+
6.8p
6C9
4R19
6R13
5R11
1K0
6D2
150R
34K8
G
6R14
5R11
6R10
6OUT
5R11
5R11
5R11
5R11
5R11
5R11
6
6RM
6C4
G
7
G
7R7
7R8
7R6
7R5
7R4
7R3
7R2
7R1
5R11
5R11
8
6Q9 6Q11
6D3
6C14
100p
G8
7P1
9
6R11
499R
6R12
5R11
6R6
10K0
6Q4
200
100N
6R2
3K48
6Q3
200
6C10
100N
6Q7
100
6D1
7J2
6R8
G
6Q5
200
6R4
6RF
150R
47u
6C7
6C1
100N
6C6
6R1
2K61
1K0
6CE
100p
10R0
6Q2
100
6R3
2K61
4R9
6Q1
100
470p
4C11
100N
G
OUT R
2
1
H12
H11
10
PCB BHA1 FEMALE R5
PCB7
3
+VB
6R18
100R
100p 6C2
6C13 6.8p
10R0
4R20
4R21
10R0
G
+20F
+
6R7
10K0
10K0
+
4R14
5R11
+
4700u
6CF
MJD243
MJD243
1K0
6RB
RL6B
4C5
4C9
4R15
5R11
4R13
5R11
4Q6
100
-20D
H8
6CA
270p
4C15
4Q12
4Q10
4Q8
200
47p
47u
4R3
2K61
4CH
4RH
20K0
47p
G
4C8
100N
6R17
4RM
4Q11
4R11
499R
4R12
5R11
4R10
1K0
6.8p
+
G
1K0
100p
47p
4R6
10K0
4R7
10K0
4C14
100p
G
2R11
100R
150R
2C5 47p
47u
2R6
+
2C9
2R3
2K61
2C8 100N
47p
4K99
R4R
4D3
4D2
B10
B1
150R
4C7
4C1
47u
4C6
100p
6RA
4OUT
4C4
RL3A
G
MJD253
-VB
4Q9
4D1
MJD253
G
4Q4
200
4CF
2Q6
100
B6
100N
4R1
2K61
4R2
34K8
BAL
RIGHT
4RA
1K0
4CE
100p
4R17
10R0
2R9
68R1
2Q8
200
B9
4Q3
200
4R4
34K8
100K
100R
150R
2C1
47p
2D2
2R8
68R1
2K0
4Q2
100
4R8
4Q7
100
4C2
6.8p
4Q1
100
4C10
100N
4CM
B4
4CA
270p
R10R
B13
2C4
6.8p
4C13
100p
100R
4R18
G
4Q5
200
150R
R5R
RL7A
5J4
C3R
4K99
2R4
34K8
R3R
49R9
4K99
100
+20D
+
G
4RF
4K75
R2R
2Q4
200
2Q3
200
RL2B
5J5
B7
2D1
2Q7
2D3
270p
2Q2
100
B8
2R7
B12
150R
100N 2C3
C1R
VRBA
G
B11
49R9
2C2
6.8p
2Q1
100
R6R
R1R
4K99
2Q5
200
B5
VRA
VOL
9
POWER OP AMPS
+VB
+VB
2R2
34K8
4K99
R7R
RL2A
B2
100N
2R1
2K61
4K99
47p
B3
A
2R5
G
C4R
R8R
+20B
2C7
47u
2C6
PCB BHA1 MB R5
8
MJD253
100R
R9R
2R10
+
7
POWER OP AMPS
INPUT BUFFERS
PCB5
6
75K0
5
MJD253
4
6C3
3
4C3
2
100N
1
PCB BHA1 - MPS2 R5
Rev : 5
8
9
10
BHA-1 HEADPHONE AMPLIFIER
BHA-1 EXTERNAL DIMENSIONS
BHA-1 MODEL CODES
There are no user serviceable parts inside the BHA-1. Please refer any servicing to qualified personnel.
300028-2[BHA1]20120307
BRYSTON LTD., PETERBOROUGH, ONTARIO, CANADA