Vox NT15 Schematic
5
4
3
2
1
E E
Bright
SM1 DPDT Mini Toggle
R36
10 MEG
1 3
1 3
1 3
1
2
3
4
5
6
Thick
CW
2
CW
2
CW
2
R35
1 2
150K
Gain
VR 2
13
1 MEG A
CW
2
B= +1V35
T= +0V
+3V
C28
12
12
R9
C9
220K
100 pF
B= +124V
T= +112V
V3A
R21
1 2
12
34
10K
J1
Input
D D
Chassis Rin g Terminal
C C
B B
FB1
12
12
C20
1000 pF
12
12
R34
C25
1MEG
0.1uF
400V
12AX7A
R22
7
1 2
27K
12
R20
1 Meg
8
469
B= +0V92
T= +0V75
C19
10 pF
12
12
+
C21
1.0 uF / 50V
R23
1K5
12
12
4700 pF
C29
12
250 pF
VR 3
12
250K B
R37
56K
Treble
C31
12
.022 uF
400V
VR 5
1 MEG B
Bass
C32
12
.022 uF
400V
VR 4
20K B
12
R24
6K8
Mid
-3V
+246V +255V +273V +323V
C17
.01uF
12
R26
220K
12
C27
47 pF
+128V
1
V3B
2
+0V8
3
5
12
12
12
+
R10
R36
1K5
1 MEG
6 VDC
C7
2.2 uF 50 V
C22
2200 pF
12
12
B= +1V97
T= +1V67
D4
LED
12
+
12
R13
1 2
9K1 / 1 W
C14
22 uF / 45 0V
12
R27
150K
B= +3V15
T= +2V85
12
R38
10K
B= +177V
T= +176V
V4A
7
R16
1 2
9K1 / 1W
12
12
R11
100K
8
469
12
R25
1K5
12
R28
2K7
JP1
JP1
1
1
2
2
CON 2
CON 2
22 uF / 45 0V
C10
12
0.1 uF
400V
12
+
C23
10 uF / 35 V
+226V
V4B
12AX7A12AX7A12AX7A
2
3
+46V7
12
12
R19
1 MEG
+45V5
12
C2
.01uF
12
12
R3
+
C13
560 / 1/2W
3300 uF 10V
12
12
C8
+
C6
.01uF
12
C24
R32
56K
.01 uF
C16
C15
12
12
0.1uF
0.1uF
12
400V 400V
1
R33
VR1 B
470K
200K A
5
R18
1K5
R31
56K
C30
C26
12
12
0.1uF
0.1uF
12
400V 400V
VR1 A
R34
200K A
470K
+323V +325V
R1
1 2
1K / 2W
MOF
12
12
C1
+
22 uF / 45 0V
12
12
+
C11
+
C12
3300 uF 10V
3300 uF 10V
12
+
C18
22 uF / 45 0V
Volume
13
CW
13
CW
C4
.01uF
- +
4
R18
1 2
18K / 1W
12
12
12
FS2
FUSE T6.15A
YEL
TAG 7
YEL
TAG 11
TAG 12
TAG 8
TAG 4
TAG 5
TAG 9
TAG 2
TAG 10
299 VAC 287 VAC
TAG 13
Toggle Pos.
VIO
Up Pentode
C Standby
Dn Triode
YEL
S2
1
2
o
3
BLU
4
5
6
GRY
7
8oo
9
WHT
SW 3P3 T On Of f On
BLK
T2
1
YEL
4
5
2
RED
6
3
WHT
OUTPUT TX 5200 O HMS P-P
TAG 6
ORG
TAG 3
BLU
TAG 1
BLK
GRN / Y
Speaker
J2
16 Ohms
1 2
3 4
J3
8 Ohms
1 2
3 4
WHT
WHT
YEL
RED
VIO
WHT
VIO
T1
VIO
3
GRY
4
VIO
5
6
ORG
7
ORG
PWR TX D UAL SEC
Power
X1
1 2
UL SL22
S3
1 3
2 4
SW DPST
1
BLK
2
WHT
FS3
1 2
FUSE T1.25A
J4
AC FEMALE IEC INLET
1 2
3
ORG
6V14 AC
ORG
TAG 14
12
+330V
7
V2
6BQ5/EL84
R6
1 2
2
2
3K3
6V3 AC
6V3 AC
R8
1 2
9
+321V
470 / 1W
345
R4
1 2
120 / 5W
C5
+
1 2
220uF 35V
+10V3
R5
2
1 2
3K3
345
+321V
2
R7
9
1 2
470 / 1W
6BQ5/EL84
V1
7
+330V
287 VAC 299 VAC
R2
Q1
220 / 5W
12
C3
47 uF / 45 0V
1N4007
FS1
160 mA
R7
Q2
220 / 5W
12
1N4007
12
R15
100 / 1/2 W
6V3 AC
6V3 AC
12
R14
100 / 1/2 W
12
12
+
1
2
BR1
W04M
3
NOTES;
All voltages measured in Pentode Mode
A A
5
4
3
2
AC inlet voltage held constant at 120VAC 60 Hz for measurements
No signal applied. Gain and Volume set at Minimum CCW
B = Bright mode voltage T= Thick Mode voltage
Title
VOX Night Train NT-15
Size Document Number Rev
PCB_NT15H_1001_ISS2 C
D
Date: Sheet
1
of
1 1Friday, A ugust 14 , 2009
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