Bryston 14B Cirquit Diagram
INPUT, MAIN + POWER PCB'S
Page 1 of 2
14B-RCA5
4K99
R6
1K654K99
C2
14B BALIN
4K99
C2
1K65
SCHEMATIC DIAGRAM
14BSCHR8
5 Nov 2001 9
2J2 1 3
2J2C1 3
2B1
A
S1
INPUT SEL
BAL/BAL+6/UNBAL
J3
2
1 3
J3
2
1 3
C3
4K99
3K32
P4
S1T
R
2
3
XLR-1/4" JK.
XLR-1/4" JK.
3
2
1
R
S
T
P4
470u
3K32
4K99
4 6 5 7 8
4 6
5 7
3 C
1C2
C22
32C 1
4 5
6 7
4 5
6 788
4K99
C1470u
C21
C21
C1
ST
8
3
150R
R23
47K5
R22
P5
100R
100R
4K99
R6
4K99
14B-RCA5
INPUT SEL
J2
J2
BAL/BAL+6/UNBAL
J3
J3
2 1
2
1
C 1
B
S1
A
C 2
2
1
2 1
5 876C343
J3
5
8
76
3
342
31
3
443
J3
C22
P5
R22
47K5
R23
150R
C
C
3
21
J2
6
8
5
J2
6
8
775
CASE
CASE
340G-02
CASE
221A-02
T0-3PBL
TO-126
77-04
MJL21193
MJE182
MJL21194
MJE172
CB
BE C
C EB
REVISION 8 FEB 14, 2001
14B-MB PCB - CHANGED R50 - R51 TO 1K00
14B-MB PCB - CHANGED R48 TO 523R
14B-PWR PCB- CHANGED R3,R5,R6,R10 TO 49R9
14B-MB PCB R10 - CHANGED REGULATOR CIRCUITS
ADDED F2 & F3
REV 9 NOV 5, 01-ADD R25 TO INPUT SWITCH BOARD
R17
C6
10K0 10K0
R18
RCA JK
413
15K
BC
R9
R12
100K
413
BC
47pf
C3
Q5
R8
200A
150R
PN
47pf
C1
C11
Q7
.1u
182
MJE
+33V -33V
VR1
475R
R20
CHASSIS
LINK
R0
R20
475R
VR1
+33V -33V
MJE
182
.1u
Q7
C11
47pf
C1
PN
200A
150R
R8
Q5
C3
47pf
BC
413
100K
R12
R9
BC
15K
RCA JK
TRANSISTORS
3 D
1
E
2N7000
R18
R17
S
413
10K0
C6
10K0
CASE
T092
TFET
2N5550
PN100A
2N7000
2N5400
PN200A
S
ECED BG
2
G
1
3 12 32
-IN
Q1 Q3
Q2 Q4
R15
68R
1K
1K
68R
R15
D3
D5 R14
Q1
-IN
CB
31 2
WG3
U1,U2,U3
+16V
R7
R25
1K0
1M01M0
D2
D1
150R
C5
100N
R16
68R
R19
22R1
JUMPER
REG
REG
JUMPER
22R1
R19
68R
R16
100N
C5
150R
Q4BCQ2
Q3
D1
D2
R10
415
BC
15K
100K
R13
415
BC
47pf
C4
Q6
R11
100A
150R
PN
47pf
C2
C10
Q8
.1u
172
MJE
GRN/YEL
WG3
J1
J1
1
1
GND1
2
2
3
3
CH1
OUT
4
4
5
5
CHASSIS
6
7
CH2
OUT
8
CH2
9
GND2
10
13
12
1M0
R126
A
2
3
1M0
R127
A
MJE
172
.1u
Q8
C10
D4
47pf
C2
PN
150R
100A
R11
D6
Q6
C4
47pf
415
R13
100K
BC
15K
415
R10
1K0
R7
R25
10K0
R56
U1,U2
100K
15K
R2
R5
BC
413
Q1
D2
Q3
BC
415
R57
1K0
100K
15K
R3
R6
A
1N4752
D102
A
C1021u5/35
+
+16V
.1uC103
.1u C105
U2 = TLO62CN
R131 R132
14
10K
U3
U3 = TLO64
6
5
R130
10K
10K
1
U3
+16
+43V
INVERTER
BC
413
Q2
-IN
Q4
BC
415
22pf
301R
R102
1N4750
D103
3K0 2w
R129
4
301R
1N4752
R27
+
D27
C27
1u5/35
+33V
150R
47pf
R1
.1u
C11
C1
A
Q5
22pf
PN
Q7
200A
MJE
C3
182
D1
D3
R8
150R
R7
100NC5
R9
D2
D4
Q8
C4
MJE
172
PN
100A
Q6
150R
47pf
.1u
C11
R4
C2
A
-33V
F3
RXE010
14B-MB
1N4750
F2
D103
.1uC103
.1u C105
1N4752
+
D101
RXE010
3K0 2w
301R
R102
C101
1u5/35
4K75
R44
A
Q26
PN
PN
100A
100A
R51
1K0
R136
750R
10K
7
1K0
U3
R133
11
-16
R134
R49
2K21
C18
R50
1K0
220p
29K4
R125
29K4
R124
100K
R135
+16
+16
4
9
8
U3
10
220p
C119
100K
15K
15K
R47
R46
2200u/10v
R48
C17
536R
Q24
PN PN
200A200A
4K7
R45
-33V
R111
A
68R1
R110
4K99
6
R108D100
1K0
C101
4K75
U2
5
10K
R109
2u2
+33V
22P
C18
R44
D7
90K9
R53
R5410K
475K
OFFSET
VR1
90K9
R55
Q26
68R
R51
1K0
68R
220p
1K0
C21
R50
10K0
C72
47P
R72
301R
R28
D28
C28
+
1N4752
1u5/35
100A
R49
2K2
2200u/10v
Q24
200A
A
100K
R42
100P
C16
PN
PN
100A
Q25
R47
R46
15K
15K
C17
R48
536R
Q23
PN
PN
200A
100P
C17
100K
R43
4K7
D8
R45
C19
22P
-33V
+33V
2K21
22P
R40
C18
D7
Q22
2N
5400
100K
R42
100P
A
D39
68p
C27
Q27
C12
47p
Q25
C13
A
Q23
47p
C15
100P
C11
A
100K
R43
Q21
D8
C19
R41
22P
68P
C22
7K15 58J3
R39
100N
D3
1K74
R57
C14
4K75
R52
BIAS
VR2
Q20
2N
5550
1K
TRIM
4K42
R58
Q28
2N
68p
C28
G5V-2-H1-24V
MUTE RLY
+
5400
RL1
2880
2N
5550
2K21
7
G5V-2-H1-24V
MUTE RLY
RL2
+
2K21
R40
Q22
2N
5400
47p
C13
B
100N
C14
47p
C15
B
Q21
2N
5550
2K21
R41
2880
R52
4K75
68p
C27
2N
5550
Q27
68P C22
7K15
R39
D3
1K8
R57
1K
Q20
2N
TRIM
5550
VR2
R58
3K3
Q28
2N
5400
C28
68p
1K65
R40
+
D40
C40
1N4752
1u5/35
14B-MB
1,2
+43V
J2
7 J3
1u5/35
1N4752
3,4
J2
C39
+
2N
5550
F1
100R 3W
A
R39
1K65
RXE010
F2
6 J2
10 J3
9 J3
6 J3
RXE010
R15
4 J3
2K0
R37
D3
MJE
182
4K75
R38
Q19
J3
470/16
Q17
C6
2N
5400
2N
5550
C7
1K0
R30
470p
1K0
R28
1K0
R27
1K0
R26
470p
A
1K0
R29
C8
R25
1K0
2N
5400
3 J3
Q11
2N
5550
F1
6 J4
RXE010
12J3
J3
5 J2
5 J4
2 J3
1 J3
1N4004
D2
R144
1K0
F2
RXE010
6 J2
10 J3
J3
69J3
85J3
R37
2K0
D3
MJE
182
4K75
R38
Q19
J3
C5
470/16
470/16
Q17
C6
2N
200R
5400
2N
5550
1K0
C7
R30
470p
1K0
1K0
R28
R27
1K0
470p
R26
B
1K0
C8
1K0
R29
R25
2N
5400
4 J3
Q11
3 J3
6 J4
7 J3
1,2
J4
3,4
J4
2N
5550
RXE010
F1
A
R9
22R R3
300R
R34
1K5
R32
Q16
Q12
R16
300R
SECTION 'A'
300R
R36
Q14
Q10
1K5
R31
R33
200R
R8
22R
R9
22R
R34
1K5
R32
Q16
Q12
300R
R36
Q14
Q10
1K5
R31
R33
200R
R8
C5
22R
470/16
14B-PWR
R24
1K0
220p
C2
Q18
150R
R22
2N
5400
R5
R10
2N
Q9
5550
R21
150R
15030
C1
R23
1K0
220p
R6
1K0
R24
220p
C2
MJE
150R
15030
R22
Q18
2N
5400
49R949R9
R16
300R
SECTION 'B'
R10
2N
Q9
5550
R21
150R
C1
1K0
220p
R23
14B-PWR
0R20 5W
Q2 Q1
MJL
21193
MJE
15031
49R949R9 49R949R9
Q8
MJE
MJL
21194
0R20 5W
0R20 5W
R3
R19
Q2
MJL
21193
R5
MJE
Q8
15031
MJL
21194
0R20 5W
49R949R9
R6 R18
S
J1 +43
15
F GA
J1
0R20 5W
R19
R20
MJL
21193
MJL
21194
Q6
Q5
0R20 5W
R14
R15
0R20 5W
TP1
R16
MJL
Q3
21193
MJL
Q7
21194
SW1
67F075
0R20 5W
TP2
R17
R18
Q1
T
0R20 5W
SW1
67F075
R20
MJL
21193
Q6
MJL
21194
0R20 5W
R15
L1
10R 3W
4R7 5W
0R20 5W
TP1
R16
Q3
MJL
21193
Q7
MJL
21194
0R20 5W
TP2
R17
6 GND
L
J1
10
M,N,P
MJL
J1
+60
21194
11,12,13
0R20 5W
1N4004
D1
R12
10R 3W
4R7 5W
L1
R13
Q4
O
H,J,K
J1
OUT
7,8,9
R11
2uH
0R20 5W
1N4004
MJL
D2
21193
C,D,E
J1
-60
3,4,5
J1 2
MUTE
J1
B
T
J1
14
CLIP
J1
R
J1
2
J1
B
T
M,N,P
J1
+60
11,12,13
1N4004
Q5
MJL
D1
21194
0R20 5W
R14
2uH
R12
H,J,K
O
J1
OUT
7,8,9
R11
0R20 5W
R13
1N4004
D2
Q4
MJL
C,D,E
J1
-60
3,4,5
21193
F IN
GND6
PSL
GND10
A
-43
1
WG3
Page 2 of 2
A
J1
+43
3R1
1
D2
F
IN
J1
6
GND
+
C5
L
PS
J1
1000u
50V
10
GND
M,N,P
J1
+60
11,12,13
H,J,K
J1
OUT
11,12,13
C,D,E
J1
-60
3,4,5
27,000u
+
0
C2
100N
R6
15K0
C1
+
63V
27,000u
2J1
MUTE
J1 B
J1
T
14
CLIP
R
J1
2
J1
B
J1
M,N,P
J1
+60
11,12,13
C10
15K0
H,J,K
0
J1
11,12,13
OUT
C,D,E
J1
-60
3,4,5
C8
63V
F IN
J1
6
GND
+
22u
C6
50V
L
PS
J1
10
GND
A
J1
-43
3R1
1
221R
C4
22u
63VC3
27,000u
+
R1
C9 100N
+
27,000u
D3
14B-PSB
D1
LM317
Q1
R3
7K32
R2
+
50V
100N
CN
221K
2 X 33,000u/6.3V
BR1
BR1
+
KBPC352
C20
1
10N
C42
C43
-60V
10N
BR2
+60V
KBPC352
10N
C45
C44
10N
R14
100K
R15
10K
63V
R5
7K32
+
22u
50V
C7
221R
R4
Q2
LM337
D4
14B-PSB
230V ONLY
CL
GRN/YEL
WG3
GRN/YEL
WG2
JP5
JP2
JP4
100N
R19
JP3
+
C21
JP1
JP8
JP6
JP7
CHASSIS
PWR
TENP
CLIP
CH2
MUTE
GND
JP8
JP6
JP7
WG1
CHASSIS
WG3
WB2
WB3
WB4
CH2 AC HI
WW3
CH2 AC LO
WW2
WB6
YEL
BLU
RED
J8
MUTE
2
PWR
5
TEMP
4
CH1
3
CLIP
GRN
1
6
7
8
9
10
11
J8
YEL
BLU
RED
WR1
+ OUT -
OUT1"
P9
G
N
POWER INLET
WW1
120V PRIMARY
750VA750VA
BLKRED
WB6
FILE: PART No:
BREAKER
L
WB1
TXL
WIRING
BLK
BRN
TXC
TXN
WHT
ORN
WW2
CH2 AC HI
WB4
240V PRIMARY
WIRING
BLK
WHT
TXC
750VA750VA
BRN
WHT
ORN
WW3
CH2 AC LO
PSB-SSB-LOGIC
BRYSTON POWER AMP SCHEMATIC
14B-SCHR8
REMOTE INPUT
12V AC/DC
RL1
P9
+
2880
D2 D3D4
D1
D5
14B-SSB
INTERNAL FUSE
ABC-15A
F2
JP2
475R
.1uC4
GS3
PR1
499K
R42
SOFT START
JP4
30K
30K
PR2
NC
JP3
JP1
301K
200K
NC
D13
R21
301R
JP2
JP4
TXL
JP3
JP1
PR3
RL1B
267K
R4
C2
10N 50N
16R31415 13
1
R1
R17
75R
RL1A
D12
22R
33R
R13
R14
3R
D5
C3
D2
12
U1
TDA
1085C
5
32 4
R2
200K
D1
267R
R18
D8
IL4108
U3
1
6
CH 2 SOFT START
IDENTICAL TO CH1
R15
475K
R6 R7
6 7 8
+
C6
+
C7
2
4
TXN
DWG BY: REV:DATE: FEB 14, 2001 8
6
4 1
1011 9
100u/35V
100u/35V
18K2
R35
475R
PN100
U2
R16
G5V-H1-24V
D6
100R
49K9
PR5
R33
R34
PR4
510R
1K0
+
475R
18K2
Q9
R32
C15
R39
MAC 2213A10FP
2W2WD10
2
D3
47uC1
C10
+
14B-REM
PART OF 14B-RCA PCB
18K2
R30
U1
PN100
R31
10K
+
Q8
1u5
C16
C17
2u2
++
2u2
R38
200R200R
T3
D9
1K0
R9
PN100A
Q1
12K1
R11
D4
49K9
R8
C5
2U2
+
100K
R5
18K2
R12
RL1
Q2
PN100A
100u/35V
SSB ON CH2
A
B
1
1
2
1
2
5 4
25VAC
120V
230V
4
6 1U4
4
240V
120V
25VAC
GROUND SYMBOLS
INPUT GROUND
POWER GROUND
LOGIC GND (CHASSIS)
LOGIC GROUND CH 1
LOGIC GROUND CH 2
CHASSIS GROUND
LOCAL-REMOTE
S3
MOC8100
4
3
2
1
FT2984
IL4108
U4216
IL4108
2
1
2
3
4
FT2984
POWER
S2
J7
4 4
2
1
EXT PWR UP
3
5
6
7
TX1
CH1
7
2
8VAC
1
5
F3
RXE010
1K21
R51
R51
1K21
TX2
CH2
F3
RXE010
5
7
J5
TURN ON2
4
TURN ON1
3
J5
5V
5
7
8VAC
6
TURN ON
PSW ON
DLY RLY
J7
8V
PART OF
14B-PSB
2
1
4
3
J5
5
7
6
J7
2
1
3
5
6
7
2
2
1
4
3
J6
5
7
6
CH1
CH2
D11
1
D14
4
3
J6
5
C13
+
7
22u
6
J8
GND CH1
1
MUTE
2
PWR
5
TENP
4
CLIP
3
CHASSIS
6
PWR
7
TENP
8
CLIP
9
MUTE
10
GND CH2
11
J8
470u
C11
LM
+
2931A
Q5
C12
D24
D12
+
2N7000
R13
10K
R16
10K
63K4 3K65
R19
10K
R13'
10K 10K
R16'
10K
63K4 3K65
R19'
10K
REM TRIG
2N7000
5V
C12470u
+
D23
LM
2931A
Q9
C9470u
Q14
3
R18
TEMP
R21 R20
CLIP
R18'
TEMP
R21'
CLIP
Q8
R24D21
36K5
R23
36K5
5V
470u+C10
2
CH1
MUTE
1
PWR ON
Q4
2N7000
D5
R17
10K100K
Q5
2N7000
Q6
2N7000
PWR ON
Q4'
2N7000
D5'
R17'
10K100K
Q5'
2N7000
R20'
Q6'
2N7000
MUTE
CH2
14B-LOGIC
1K0
100NC8
R44
R38
9 8
10
R37
C1
2u2
1MEG
+
C2
2u2
1
13
D10
U4C
U4D
11
604R
D9
1MEG
+
5
6
1
U4B
4
MUTE
R42
1
R45
10K
MJE182
Q6
Q7
15K0
PN100A
VR1
10K
Q10
2N7000
2N7000
Q12
R28
R26
R22
D15
10R
4K99
R27
8K25
1
1
100K
LED'S
R7
12
10K
11
13
D2
2
3
1
13
D3
11
1N914
12
R7'
12
11
13
D2'
2
3
1
13
D3'
11
1N914
12
2N7000
Q11
R2
4K99
9
10
390R
221R
4K99
R3
8
U2-4081
8
10
9
U1-4011
D4
R8
100K
4K99
9
10
8
8
10
9
U1-4011
U2-4081
D4'
R8'
100K
R5
R6
Q2
2N
5550
Q3
4K99
R4
1
R2'
4K99
221R
390R
R6'
R3'
R5'
Q2'
2N
5550
Q3'
4K99
1
PC00-022-3-0
2N
R4'
5550
6
J9 LED
CH2
RED
J9
6
J9 LED
14B-LED
12
R39
100K
11
VR2
100R
R1'
150R
Q1'
25
RED
GRN25GRN
R40
VR2
100R
R1
Q1
43
COM
CH1
43SW17
J10 PSW 2 1
3
U3
1
2
R41
2M21
R42
4K75
4
C5
100N
U3
1
5
6
SW LATCH
Q13
2N7000
LED'S
150R
2N
5550
17
PWR
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