1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D
D
C
C
B
B
A
A
1
Steelpark Road
Coombs Wood
Halesowen
UK
1
NXT Main Tube Output PCB
9418
3
16/01/2007
16:47:27
9418.SchDoc
Title:
Size:
Number:
Date:
Original File:
Revision:
Sheet
of
Time:
A3
www.laney.co.uk
Industrial Estate West
FP Flame proof resister
Must only be replaced with same type and rating
Indicates safety critical component
Must only be replaced with approved type
3
4
5
8
1 2 7
V1
KT88
3
4
5
8
1 2 7
V2
KT88
3
4
5
8
1 2 7
V3
KT88
3
4
5
8
1 2 7
V4
KT88
3
4
5
8
1 2 7
V5
KT88
3
4
5
8
1 2 7
V6
KT88
3
4
5
8
1 2 7
V7
KT88
3
4
5
8
1 2 7
V8
KT88
R25
1
0
K
0
.5
W
M
F
R17
10K 0.5W MF
R9
10K 0.5W MF
R1
10K 0.5W MF
R4
10K 0.5W MF
R12
1
0
K
0
.5
W
M
F
R20
10K 0.5W MF
R28
10K 0.5W MF
R31
220R 5W
R22
220R 5W
R14
220R 5W
R6
220R 5W
R7
220R 5W
R15
220R 5W
R21
220R 5W
R32
220R 5W
R5
10R 4W WW
R13
10R 4W WW
R23
10R 4W WW
R30
10R 4W WW
R29
10R 4W WW
R24
10R 4W WW
R16
10R 4W WW
R8
10R 4W WW
H
1
H
2
H
1
H
2
H
1
H
2
H
1
H
2
H
1
H
2
H
1
H
2
H
1
H
2
H
1
H
2
R3
1R 5W
R10
1R 5W
R18
1R 5W
R26
1R 5W
R2
1R 5W
R11
1R 5W
R19
1R 5W
R27
1R 5W
G
D3
1N5408
D2
1N5408
D4
1N5408
D1
1N5408
D5
1N5408
D6
1N5408
G
G
C1
1uF 250VAC PP
C2
1uF 250VAC PP
R47
100K 2W
R43
100K 2W
G
7
6
8 4
5
9
V9A
12AU7
2
1
3
V9B
12AU7
7
6
8 4
5
9
V10A
ECC83C
2
1
3
V10B
ECC83C
R33
47K 0.5W
R34
47K 0.5W
R44
10K 0.5W MF
R36
10K 0.5W MF
R46
100K 0.5W MF
H
1
H
2
H
1
H
2
R45
68K 0.5W MF
VR4
100K
C6
47pF 1KV
R48
220K 0.5W MF
R39
220K 0.5W MF
R49
470R 0.5W
C4
100nF 400V
R37
10K 0.5W MF
R40
4K7 0.5W
G
1
2
1
HD1
HD2WL
G
TO PREAMP PCB PRESENCE & DEEP
C5
100nF 400V
D8
10V 0.5W
D7
10V 0.5W
G
R41
10K 0.5W MF
1
2
1
HD3
HD2WL
G
I/P FROM 9417 (HD3)
VR2
22K
R35
10K 0.5W
C3
100uF 100V
R38
10K 0.5W MF
G
G
B
IA
S
A
D
JU
S
T
1
LED1
BLUELED
LED3
BLUELED
LED5
BLUELED
LED7
BLUELED
LED2
BLUELED
LED4
BLUELED
LED6
BLUELED
LED8
BLUELED
TUBE STATUS LEDS
TUBE STATUS LEDS
C7
4.7nF 1KV
G
C8
4.7nF 1KV
G
G
TO PSU PCB
All capacitors to be 100V minimum rating unless stated otherwise
BALANCE
TO
O
U
TP
U
T
TR
A
N
S
FO
R
M
E
R
+
V
TO
O
U
TP
U
T
TR
A
N
S
FO
R
M
E
R
-v
-100V
+310V
+320V
SP2
SP1
SK1
BladeFuse
VR1
100R 0.5W
G
HEATER SUPPLY
TX
P
rim
ar
y
Mains transformer wiring
details shown on 9420
Schematic.
From Mains TX
0-6.3V
H1
H2
1
2
3
4
5
6
HD2
TMF06MS
TO OUTPUT TRANSFORMER C/T
1
2
3
4
SK2
TMF04MS
+600V
TO OUTPUT TRANSFORMER
F1 - 30A L
1
2
3
4
5
6
7
8
SK3
SIL8W
1 2 3 4 5 6 7 8
SK4
SIL8W
1 2 3 4 5 6 7 8
SK5
SIL8W
1 2 3 4 5 6 7 8
SK6
SIL8W
LED9
REDLED
G
Normal Led Sequence.
(Colour)
(Reason)
1: At switch on:
Red
OK, Warming up
2: After warm up:
Off
OK, No Signal
3: Signal present:
Flashing Blue
OK, Signal Present
Fault Conditions.
1: After warm up:
Red
Faulty tube and/or fuse failure:
(If all tubes, bias may be
wrongly set)
2: After warm up:
Blue
Faulty tube
(If all tubes, bias may be
wrongly set)
LED10
REDLED
G
LED11
REDLED
G
L
E
D
1
2
R
E
D
L
E
D
G
G
+15V
-15V
LED14
REDLED
G
LED13
R
E
D
L
E
D
G
LED15
REDLED
G
LED16
REDLED
G
TO PCB 9425
TO PCB 9425
VR3
470K
G
R
4
2
1
0
0
K
0
.5
W
M
F
F2
FUSE
F4
FUSE
F6
FUSE
F9
FUSE
F3
FUSE
F5
FUSE
F8
FUSE
F7
FUSE
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
-
T
2
5
0
m
A
L
1
2
3
HD4
HD3WL
G
TO 9417 HD2
+15V
-15V
P1
P2
