Technical specifications – VHT Special 12/20 RT Head User Manual
Page 10
1
2
3
4
5
6
8
7
A
B
C
D
8
7
6
5
4
3
2
1
D
C
B
A
Title
Number
Revision
Size
A3
Date:
21-Sep-2011
Sheet 1 of 1
T
T NC
G NC
G
JK2
CLEAN
R2
33K
R1
1M
C2
101/500V
6
7
8
V1B
12AX7
C1
103/500V
R4
1K5
R3
100K
B+5
C4
221/500V Mica
C5
104/400V
C6
473/400V
R5
100K
R6
180K
R7
33K
R8
33K
R9
6K8
R10
68K
T
T NC
G NC
G
JK3
FOOT SWITCH
S1/VR2
1
2
3 VR1 1M
C7
471/500V Mica
C9
103/630V
Push/Pull Pot
Push = Closed (Clean)
Pull = Open (Boost)
1
2
3 VR2
1M
1
2
3
V1A
12AX7
R11
470K
R12
1K5
R13
100K
R14
1K5
R15
1K5
C10
224/400V
T
T NC
G NC
G
JK4
SEND
T
T NC
G NC
G
JK5
RETURN
B+5
R23
3M3
R18
220K
R19
1K5
6
7
8
V2B
12AX7
B+4
C11
103/500V
C20
472/400V
Ceramic
Ceramic
CLEAN
TONE
Ceramic
VHT Special 12/20RT
Rev1.0
C8
472/400V
T
T NC
G NC
G
JK6
LINE OUT
80mV AC
TP4
80mV AC
TP5
80mV AC
TP6
30mVAC
TP1
1V DC
TP2
65V DC
TP3
0.7V DC
TP7
R70
10K/3W
C52
47
u/5
00
V
C53
10
4/6
30
V
R32
56K
R34
1K5
1
2
3
V5A
12AX7
B+3
C33
223/400V
C34
223/400V
R38
220K
R37
220K
R36
5K6
R54
1K 5W
D3
1N4007
D4
1N4007
S2
POWER SWITCH
RED
BROWN 0V
GREEN
GREEN
BLACK
BLACK
WHITE
WHITE
WHITE
YELLOW/GREEN
J3
J5
J4
J6
D1
IN4007
D2
IN4007
C43 8.2n/1KV
C44 8.2n/1KV
C46 8.2n/1KV
C45
8.2n/1KV
F1
T2A/250V SLO BLO
BLACK
T1
RT1
NTC(10R/5A)
NF72-10D15
AC
IEC
R62
220K
C47
100u/350V
R64
470K R65
100K
R66
100K
R69
33K/3W
C51
47
u/5
00
V
C49
47
u/5
00
V
C50
47
u/5
00
V
T2
RED
BLUE
BLACK 0ohm
B+1
YELLOW 4ohm
BROWN 8ohm
ORANGE 16ohm
1
2
3
VR8B
1M
G
D
S
Q1
FQP9N90C
B+3
R67
10R 5W
R68
1K 3W
ZD1
12V 1W
B+2
R40
1M
R41
1M
R42
1M
R43
1M
R44
1M
R45
1M
12" 16 OHMS
S1A
S1B
S1C
S1D
S1E
S1F
C21
474/100V
C22
1u/100V
C24
4u7/63V
C25
10u/63V
C26
22u/63V
DEPTH
2P-6T ROTARY SWITCH
3
5
8
4
V6A
6V6GT
B+4
FILM
FILM
B+1
T
T NC
G NC
G
JK7
EXT SPK1
T
T NC
G NC
G
JK8
EXT SPK2
320V DC
TP14
212V DC
TP18
218V DC
TP17
308V to 29V DC
TP15
303V to 29V DC
TP16
S4
C35
2u2/100V(I)
C36
3u3/100V(II)
TEXTURE
FILM
FILM
R56
15R 10W
C57
0.1/630V
T
T NC
G NC
G
JK9
INTERNAL SPK
S5
DP3T
4 OHM
8 OHM
16 OHM
F3
T0.5A/250V
WATTS
BROWN
3
5
8
4
V7A
6V6GT
R39
5K6
R35
56K
R33
1M
R55
1K 5W
R46
470R 5W
B+2
F2
T8A/250V SLO BLO
V1
12AX7
V6
6V6GT
V7
6V6GT
V2
12AX7
29
.2
V
D
C
TP
11
68V DC
TP13
29
4V
D
C
TP
10
10V AC @ 8ohm
TP19
ON
ON
STBY
S3A
STB ON/ON
S3B
S3C
ST
B
Y
TR
IO
D
E
PE
N
TO
D
E
4
5
4
5
2
2
7
7
9
9
6.8V
12V
C56
470u/16V
T
T NC
JK1
9V DC OUT
R73
100R
R74
100R
R72
220R
D10
LED(RED)
D5
1N4007
D6
1N4007
D8
1N4007
D7
1N4007
OUT
G
IN
U1
7809
R47
1M
R48
1M
R49
1M
R50
1M
R51
1M
R52
1M
S2A
S2B
S2C
S2D
S2E
S2F
C27
474/100V
C28
1u/100V
C30
4u7/63V
C31
10u/63V
C32
22u/63V
FILM
FILM
R53
470R 5W
V3_8
V4_8
V3_8
V4_8
D9
IN4007
C42
0.
1/
63
0V
S6
EL34/6V6GT
ORANGE
YELLOW
26
5V
31
0V
17V
17V
100V
100V
S7
DP3T
234V
117V
100V
BLUE
WHITE
ORANGE
BROWN
RED
YELLOW
1
2
3
VR3
100KA
1
2
3
VR4
250KA
R17
33K
R16
1M
R28
100K
SEND
LEVEL
RETURN
LEVEL
121V DC
TP20
1
2
3
V4A
12AX7
6
7
8
V4B
12AX7
R31
100K
R30
1K5
C16 10PF
C13
103/630V
R29 100R
B+5
V3
12AX7
4
5
9
R71
10K/3W
C54
47
u/5
00
V
C55
10
4/6
30
V
B+5
212V DC
TP18
B+
0.7V DC
TP7
C12
4u7/63V
F4
T1A/250V SLO BLO
D11
LED (RED)
R75
220R
C23
2u2/63V
C29
2u2/63V
C48
100u/350V
R63
220K
R57
180K
R58
330K
R59
47K
R61
2K2
6
7
8
V5B
12AX7
1
2
3
VR6
B500K Speed
1
2
3
VR7
B250K Depth
C37
473/630V
C38
473/630V
C39
104/630V
C40
104/630V
C41
22uF/25V
S2B
Tremolo
R60
220K
B+3
0.6~1.6V
V5
6V6GT
2
7
V4
12AX7
4
5
9
R20
220K
R21
470R 5W
C14
222/400V
C15
22uF/63V
Reverb
Transformer
B+2
Red
Blue
2.2V
3
5
8
4
V3A
6V6GT
R22
1K 5W
R24
100K
R27
220K
R25
220K
R26
1K5
1
2
3
V2A
12AX7
1
2
3
VR5
B100K Reverb
C17
332/630V
B+4
REVERB TANK
C18
4u7/63V
C3
4u7/63V
C19
4u7/63V
1
2
3
VR8A
A1M
S2A
Reverb
VR5-SW
Reverb DEEP
C17*
472/630V
R57
1M
FA
ST
/S
LO
W
TECHNICAL SPECIFICATIONS
Name/Model:
VHT Special 12/20 — 12-20 watt hand-wired vacuum tube
guitar amplifier
Power Requirements & Consumption:
100/115VAC, 50/60Hz; 120VAC, 60Hz;
220/230/240/VAC,
50/60Hz
Maximum Output Power:
12-20 watts (depending on output tube type and Volt setting)
Speaker (combo only):
One 12” VHT ChromeBack (60-watts, 16 ohms)
Amp Type:
All-tube hand-wired push/pull cathode biased output stage
Tubes:
Four
12AX7;
three
6V6
Controls:
Volume (with Pull-Boost), Tone, Reverb (with Pull-Deep),
Tremolo
Speed,
Tremolo
Fast/Slow
Range,
Tremolo Intensity and Depth, Texture, Depth, Watts,
Pentode/Triode, Effects Send Level, Effects Return Level,
High/Low
Volts
Cabinet: Finger
jointed
birch
plywood
Cosmetics:
Black vinyl, white piping, and black grille cloth
Dimensions (H x W x D):
Combo: 19’’ x 19.5’’ x 10.5”
(475mm x 495mm x 265mm)
Head: 11” x 19.5’’ x 8.5’’
(280mm x 495mm x 215mm)
Net
Weight:
Head:
28
lbs.
(12.5
KG)
Combo:
43
lbs.
(19.5
KG)
16
15