Download TRIODE ELECTRONICS 1987 50W PLEXI LAYOUT

TRIODE ELECTRONICS 1987 50W PLEXI LAYOUT
Pilot
Light
Stand-By
A
Presence
5K L
Middle
25K L
Bass
1M A
Bright
Volume
1M A
Treble
250K L
Normal
Volume
1M A
0.1uF
P2
1K
3
2
7
6
5
8
4
1
1K
3
1R
C
1W
5W
2
7
25V
820
0.022uF
2.7K
0.68u
F
68K
68K
68K
K
100
10
0K
0.022uF
68K
470K
820
0.68uF
470K
500pF
1M
500pF
100K
0.022uF
0.022uF
10K 2W
33+33uF
450V
0.022uF
10K
0.1uF
470
220
K
0.022uF
1M
1
9
8
3
8
7
1
1R
2
4
6
5
9
8
7
1
2
6
1
9
3
100K
1W
1W
4
33K
C
6K
5.
K
5.6
6
5W
82K
10K 2W
Choke
OT CT
G2
5
K
220
47K
8.2K 2W
47K
47pF
15K
G1
G2
K
50KL
220K
10uF
150V
10uF
150V
GREEN
GRN/YEL
GREEN
RED/YEL
BROWN (240V)
G1
8.2K 2W
YELLOW
YELLOW
RED
RED
WHITE (230V)
BLUE
ORANGE (220V)
BLACK (120V)
B
Cap Mounted
Horizontally on
Side of Chassis
1M
1M
100
P1
220uF
P1
0.022uF
Power
2
3
8
4
7
5
4
6
5
1W
B
OT PRIMARY
P2
MAINS FUSE
A.C. POWER
3A SB for 120V
2A SB for 220V or 240V
H.T. FUSE
500mA
8 Ohms
L
E
(Common)
4 Ohms
N
16 Ohms
OT SECONDARY
A
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: 17.5/440 = .
040 or 40mV) This is your desired bias voltage (probably between 35 and
45 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.
SPEAKER
OUTPUT
Notes:
*Check Polarity (+ & -) of all Electrolytic Capacitors.
*You may need to lightly sand the back of the potentiometers to be
able to solder the bus wire correctly.
*All Resistors are 1/2W Unless Noted
*Power Transformer: 40-18033
*Output Transformer: 40-18025
*Choke: 40-18058 (3H), 40-18059 (20H), or 40-18032 (5H)
For Technical Questions or Comments, Email us at: [email protected]
PINOUTS
6CA7/EL34
12AX7 / ECC83