Download TRIODE ELECTRONICS JCM800 2203 100W LAYOUT

TRIODE ELECTRONICS JCM800 2203 100W LAYOUT
Pilot
Light
Power
Presence
Stand-By
Treble
Middle
Bass
470K
Volume
Master
500pF
LO
A
25K L
uF
0 .1
To All X
Filaments
1M A
25K L
1M A
250K L
1M A
HI
4.7K
B
1M
Shielded
Wires
15K
X
3
1R 1
W
X
G
1
4
5.6
K
2
1
X
1K
5W
5
8
4
3
1R 1
W
3
5
X
6
5 .6
K1
2
X
1K
7
5
8
W
5W
4
1
3
1R 1
W
X
6
5.6
K1
F
7
8
W
2
X
1
1R 1
W
4
pF
5
3
X
1
4
2
3
X
Cap Underneath Board
C
A.C. POWER
MAINS FUSE
4A 120V
3A 240V
25KL
Bias
D
B
HT FUSE
1A
Bias Adjustment for EL34's:
1) With speaker load connected, turn power “ON” and let tubes warm up. Switch standby
to "ON."
2) Set your meter to the Highest DC volts setting (600V or higher), and put the common
(ground) lead on one of the chassis mounting nuts or alligator clip it to the chassis.
Touch the positive lead to Pin 3 (plate) of one of the EL34 power tube sockets. This is
your Plate Voltage. Write it down.
*BE VERY CAREFULL WITH THIS STEP (HIGH VOLTAGES PRESENT)*
3) EL34's are 25 watts maximum dissipation and you want to set the bias to 70% max
dissipation. (70% = 17.5 watts) Divide your desired wattage by the plate voltage that you
wrote down from step 2. (example: 17.5/450 = .038 or 38mV) This is your desired bias
voltage (probably between 30 and 40 mV).
4) Set your meter to lowest DC Volts setting (200mV or less) and touch the common
(ground) lead to the grounded side of the 1 ohm resistor coming off of Pin 1 and the
positive lead to the Pin 1 side. Adjust the bias potentiometer until the bias voltage you
calculated from from Step 3 is achieved.
Plate voltage will change a little when adjusting the bias, so you may need to take
another reading from Pin 3 and adjust your equation accordingly and repeat steps 3 & 4.
BIAS POT
TO GROUND
IMPEDANCE
SELECTOR
SPEAKER
OUTPUT
Notes:
*Twist filament wires together tightly
*Check Polarity (+ & -) of all Electrolytic Capacitors.
*All Resistors are 1/2W Unless Noted
*Shielded Wires are only grounded at one end.
*Power Transformer: 40-18024
*Output Transformer: 40-18026
For Technical Questions or Comments, Email us at:
[email protected]
PINOUTS
6CA7 / EL34
12AX7 / ECC83
10K
0.68uF
2.7K
0.022uF
100K
7
6
1
2
)
E7
1W
7
6 100K
9
VI
2
5
8
W
X
4 OH M
7
6
4
X
8
OM
T (C
OLE
3
K1
5W
5
1
2
X
ORANG
E
4
5.6
1K
BLUE
5
X
6
RED
5W
7
6
O.T.
Secondary
X
9
10
0
8
O.T.
Primary
1K
0.022uF
100K
CHOKE
68K
CHOKE
OHM
C
D
33K
47pF
GREEN 16
3W
WH
ORANGE
56
K
470K
470K
820
500pF
100K
500pF
0.022uF
0.022uF
10K 1W
9
1M
470
1M
10K 1W
0.022uF
10K
0.1uF
82K
10K
10
0K
1W
10uF 160V
0.022uF
0.022uF
22
0K
220K
1W
10K
27K
WHITE
BLUE
10uF 160V
8
YE
LL
OW
YELLOW 8 OHMS
GR
EE
N
A
47K
)
ITE
VIOLET 240V
3W
Choose
your wall
voltage &
connect to
GREEN
BLUE 220V
GREY
BL
AC
K
BL
AC
K
RED 120V
56
K
F
100K
E
G