PROEL PRL Series Operating manual

PRL500
PRL900
PRL1300
PRL POWER AMPLIFIERS
Technical Service Manual
Technical Service Manual

PRL500 -900 -1300 T e s t & C a l i b r a t i o n
Required Test Equipment:
•Function Generator
•20 Mhz Dual-channel Oscilloscope
•Power Load Bank (4Ω-350W min.)
•2 Digital Multimeters (Tester)
•PROEL Test Cable
•Variac (0V ac –230V ac, 15A)
Test Procedure
Connections:
•Connect the Function Generator output on CH1 input Jack or XLR socket.
•Connect the Power Load Bank with Speakon on the output sockets.
•Connect the Dual-channel Oscilloscope on Binding Post outputs.
•Connect the PROEL Test Cable to the TP Test Points of the amplifier and the two
other side terminals to the Testers setted at 200mV range.
•Set the Variac at 0V and connect its output to the mains cable of the amplifier.
Verifying:
•Switch on the amplifier, then slowly rise the Variac voltage till 230V and check the
value on the Testers is the most low as possible (few mV). If not check the correct
mounting of MJ21193/MJ21194 transistors.
•In same time the relays are activated and the protect red led turns off.
•Set the amplifier in parallel mode.
•Set the Function Generator on 1KHz sinewave at 0.2V RMS and check on the
Oscilloscope monitor the output signals have the same amplitude and phase.
•Then rise the Function Generator amplitude till 1V RMS and check on the
Oscilloscope monitor the output signal is not squared.
•Set the amplifier in bridge mode.
•Set the Function Generator on 1KHz sinewave at 0.2V RMS and check on the
Oscilloscope monitor the output signals have the same amplitude and opposite
phase.
•Then rise the Function Generator amplitude till 1V RMS and check on the
Oscilloscope monitor the output signal is not squared.

PRL500 -900 -1300 B i a s C a l i b r a t i o n
Required Test Equipment:
•Function Generator
•20 Mhz Dual-channel Oscilloscope
•Power Load Bank (4Ω-350W min.)
•Variac (0V ac –230V ac, 15A)
Test Procedure
Connections:
•Connect the Function Generator output on CH1 input Jack or XLR socket.
•Connect the Power Load Bank with Speakon on the output sockets.
•Connect the Dual-channel Oscilloscope on Binding Post outputs.
•Set the Variac at 0V and connect its output to the mains cable of the amplifier.
Verifying:
•Switch on the amplifier, then rise the Variac voltage till 230V. In same time the
relays are activated and the protect red led turns off.
•Set the amplifier in parallel mode.
•Set the Function Generator on 1KHz sinewave at 0.2V RMS and check on the
Oscilloscope monitor the output signals have the same amplitude and phase.
•Verify that on the sinewave there is not the “crossover distortion”. (*)
Only if the “crossover distortion” is present adjust the trimmer VR1for CH1, VR2
for CH2.
(*)
sinewave without sinewave with
“crossover distortion” “crossover distortion”

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Date: 23-May-2001 Sheet of
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1
5
3
2
4
6
S2
1
5
3
2
4
6
S3
3
21
84
IC1-A
TL072
3
21
84
IC2-A
TL072
C16
100N
C17
100N
C1
100N
C18
100N
C15
100N
C2
100N
C7
100N
C8
100N
C5
100N
+15VB+15VA
-15VA -15VB
NCNC
NC NC
5
67
IC1-B
TL072
C3
100N C4 100N C6 100N
5
67
IC2-B
TL072
C9
100N
C10
100N
C12
47U 25V
C11
47U 25V
C13
47U 25V
C14
47U 25V
+15VB
-15VB
-15VA
+15VA
1
23
S4
1
23
S5
1
2
3
CN2
1
2
3
CN3
1 2
CN4
1 2
CN5
1 2
CN6
1 2
3 4
5 6
7 8
9 10
11 12
13 14
CN1
IN_LOW
OUT_LOW
OUT_HIGH
IN_HIGH
SW1
R2
9K09 1%
R9
22E
R1
9K09 1%
R10
22E
R4
9K09 1%
R3
9K09 1%
R11
22E
R12
22E
R5
9K09 1% R6
18K 1% R8
9K09 1% R7
18K 1%
CROSSOVER PRL 1300/900/500
PROEL S.p.A.

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C1
100N
+12V
+12V
R1
100K
R11
330R
R3
100K
R5
220K
R2
5K6
VR1
22K
R4
10K
R12
10K
LED CONTROL PRL 1300/900/500
1
2
3
4
5
6
CN1
DL1
3
21
4 11
IC1-A
LM324
5
67
IC1-B
LM324 10
98 IC1-C
LM324
+12V
R10
100K
R14
330R
R8
100K
R6
220K
R9
5K6
VR2
22K
R7
10K
R13
10K
12
13 14
IC1-D
LM324
R
GY
R
GY
LEFT
RIGHT
CLIP
SIGNAL
CLIP
SIGNAL
+12V
PROT
DL3
DL2
PROEL S.p.A.

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POWER SUPPLY PRL 500
D1
KBPC036-06
C3
47N 250V
C8
47N 250V
C1
47N 250V
C4
47N 250V
F1
5A T
F3
5A T
+VA
-VA
1
2
3
CN1
C25
10000U 100V
C18
10000U 100V
D3
KBPC036-06
C16
47N 250V
C7
47N 250V
C6
47N 250V
C2
47N 250V
F4
5A T
F2
5A T
+VB
-VB
1
2
3
CN3
C19
10000U 100V
C28
10000U 100V
1
2
3
4
5
6
CN7
D8 1N4007
D9 1N4007
1
2
3
CN2
D2
W02M
C12
2200U
C5
2200U
C15
47U
C11
47U
C13
47N
C9
47N
C14
47N
C10
47N
Vin
1
GND
2
+12V 3
IC2
MC7812
Vin
2
GND 1
-12V 3
IC1
MC7912
+12V
-12V
1
2
CN4
R18
22K
R15
330E
R17
4K7
R4
47K
R14
10K
R10
100K
R8
220K
R9
1K
R1
33K
R11
10K
R2
33K
R3
47K
C22
47U
C21
100U
D5
1N4007 D4
1N4007
D7
1N4148
D6
5V1 0.5W
TR5
BC327
TR1
BC327
TR2
BC337
TR4
BC337
TR3
BC337
RL2
RL1
+12V
1
2
CN6
-12V
R7
10E 2W R6 10E 2W
R16
5E6 2W
R13
10E 2W R12 10E 2W
R5
5E6 2W
C24
100N 100V
C23
100N 100V
L2
100uH
L1
100uH
+12V
OUT_R
OUT_L
GND_R
GND_L
PROEL S.p.A.

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POWER SUPPLY PRL 900
D1
KBPC036-06
C3
47N 250V
C8
47N 250V
C1
47N 250V
C4
47N 250V
F1
8A T
F3
8A T
+VA
-VA
1
2
3
CN1 C26
4700U 100V
C25
4700U 100V
C18
4700U 100V
C17
4700U 100V
D3
KBPC036-06
C16
47N 250V
C7
47N 250V
C6
47N 250V
C2
47N 250V
F4
8A T
F2
8A T
+VB
-VB
1
2
3
CN3 C19
4700U 100V
C20
4700U 100V
C27
4700U 100V
C28
4700U 100V
1
2
3
4
5
6
CN7
D8 1N4007
D9 1N4007
1
2
3
CN2
D2
W02M
C12
2200U
C5
2200U
C15
47U
C11
47U
C13
47N
C9
47N
C14
47N
C10
47N
Vin
1
GND
2
+12V 3
IC2
MC7812
Vin
2
GND 1
-12V 3
IC1
MC7912
+12V
-12V
1
2
CN4
R18
22K
R15
330E
R17
4K7
R4
47K
R14
10K
R10
100K
R8
220K
R9
1K
R1
33K
R11
10K
R2
33K
R3
47K
C22
47U
C21
100U
D5
1N4007 D4
1N4007
D7
1N4148
D6
5V1 0.5W
TR5
BC327
TR1
BC327
TR2
BC337
TR4
BC337
TR3
BC337
RL2
RL1
+12V
1
2
CN6
-12V
R7
10E 2W R6 10E 2W
R16
5E6 2W
R13
10E 2W R12 10E 2W
R5
5E6 2W
C24
100N 100V
C23
100N 100V
L2
100uH
L1
100uH
+12V
OUT_R
OUT_L
GND_R
GND_L
PROEL S.p.A.

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POWER SUPPLY PRL 1300
D1
KBPC036-06
C3
47N 250V
C8
47N 250V
C1
47N 250V
C4
47N 250V
F1
8A T
F3
8A T
+95A
-95A
1
2
3
CN1 C26
6800U 100V
C25
6800U 100V
C18
6800U 100V
C17
6800U 100V
D3
KBPC036-06
C16
47N 250V
C7
47N 250V
C6
47N 250V
C2
47N 250V
F4
8A T
F2
8A T
+95B
-95B
1
2
3
CN3 C19
6800U 100V
C20
6800U 100V
C27
6800U 100V
C28
6800U 100V
1
2
3
4
5
6
CN7
D8 1N4007
D9 1N4007
1
2
3
CN2
D2
W02M
C12
2200U
C5
2200U
C15
47U
C11
47U
C13
47N
C9
47N
C14
47N
C10
47N
Vin
1
GND
2
+12V 3
IC2
MC7812
Vin
2
GND 1
-12V 3
IC1
MC7912
+12V
-12V
1
2
CN4
R18
22K
R15
330E
R17
4K7
R4
47K
R14
10K
R10
100K
R8
220K
R9
1K
R1
33K
R11
10K
R2
33K
R3
47K
C22
47U
C21
100U
D5
1N4007 D4
1N4007
D7
1N4148
D6
5V1 0.5W
TR5
BC327
TR1
BC327
TR2
BC337
TR4
BC337
TR3
BC337
RL2
RL1
+12V
1
2
CN6
-12V
R7
10E 2W R6 10E 2W
R16
5E6 2W
R13
10E 2W R12 10E 2W
R5
5E6 2W
C24
100N 100V
C23
100N 100V
L2
100uH
L1
100uH
+12V
OUT_R
OUT_L
GND_R
GND_L
PROEL S.p.A.

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TR25
MJ21193
TR26
MJ21193
TR18
MJ21193 TR17 MJ21193
TR34
MJE15031
TR31
MJ21194
TR32
MJ21194
TR23
MJ21194
TR24
MJ21194
TR33
MJE15030
R3
0.47E 3W
R58
22E 1W
R63
1K2 5W
R64
1K2 5W
R38
10E 2W
R26
0.47E 3W
R30 0.47E 3W R27 0.47E 3W
R29
0.47E 3W
R5
0.47E 3W
R6
0.47E 3W
R2
0.47E 3W
R34
22E 1W
R41
10E 2W
C1
3N3
C5
3N3
C9
1N5
C29
27P
C2
2N2
C3
33N
D5
1N4007
D12
1N4007
D14
1N4007
D19
1N4007
D4
1N5403
D17
1N4007
D6
1N4007
D3
1N5403
D15
1N4007
R40
47E
VR1
100E
R51
1K
R39
1K
R95
100E
R86 22K 1/2W
D13
3V9 1W
D18
4V7 1W
VR3
2K2
R35 NTC 50R
°C
R62
680E 5W
R77
75K 1%
C40
120N
R79
820E
R83
100E
D32
W02G
5
67
IC3-B
NE5532 3
21
8 4
IC3-A
NE5532
C30
47P
R76
10K
R75
10K
R78
6K8
JS6
D31
15V 1W
D25
15V 1W
C15
220U 25V
C28
220U 25V
C31
100N
C36
100N
-15VA
+15VA
+15VA
-15VA -VA
+VA
OUT_L
TR2
MJ21193
TR1
MJ21193
TR10
MJ21193
TR9
MJ21193
TR36
MJE15031
TR8
MJ21194
TR7
MJ21194
TR16
MJ21194
TR15
MJ21194
TR35
MJE15030
R25
0.47E 3W
R31
0.47E 3W
R33
22E 1W
R70
1K2 5W
R72
1K2 5W
R28
0.47E 3W
R42
10E 2W
R1
0.47E 3W
R8
0.47E 3W
R4
0.47E 3W
R32
0.47E 3W
R7
0.47E 3W
R37
22E 1W
R45
10E 2W
C7
3N3
C8
3N3
C12
1N5
C17
27P
C6
2N2
C4
33N
D10
1N4007
D8
1N4007
D7
1N4007
D30
1N4007
D2 1N5403
D29
1N4007
D11
1N4007
D1
1N5403
D23
1N4007
R44
47E
VR2
100E
R47
1K
R43
1K
R93
100E
R53
22K 1/2W
D9
3V9 1W
D22
4V7 1W
VR4
2K2
R36 NTC 50R
°C
R71
680E 5W
R52
75K 1%
C15
120N
R56
820E
R54
100E
D24
W02G
5
67
IC2-B
NE5532
3
21
8 4
IC2-A
NE5532
C23
47P
R60
10K
R59
10K
R65
6K8
JS3
D21
15V 1W
D20
15V 1W
C10
220U 25V
C11
220U 25V
C21
100N
C22
100N
-15VB
+15VB
+15VB
-15VB -VB
+VB
OUT_R
5
67 IC4-B
TL072
3
21
8 4
IC4-A
TL072
C33
4U7 25V
C34
47P
DL3
14
3 2
R82
2K2
R80
27K
1
2
3
CN4
R90
10K
R85
1K
R89
10K
R88
10K
R84
10K
C35
47P
C39 47P
D34
15V 1W
D35
15V 1W
D36
15V 1W
D33
15V 1W
1
2
3
CN7
1 2
3 4
5 6
7 8
910
11 12
13 14
CN3
C42
100N
C38
100N
C41
47U 25V
C37
47U 25V
R91
22E
R87
22E
-15VA
+15VA
5
67
IC1-B
TL072
3
21
8 4
IC1-A
TL072
C19
4U7 25V
C13
47P
DL1
14
3 2
R50
2K2
R48
27K
1
2
3
CN1
R69
10K
R57
1K
R68
10K
R67
10K
R55
10K C14
47P
C26 47P
D27
15V 1W
D15
15V 1W
D25
15V 1W
D26
15V 1W
1
2
3
CN2
C27
100N
C25
100N
C24
47U 25V
C20
47U 25V
R66
22E
R61
22E
-15VB
+15VB
JS1 JS4
JS2
JS5
R46
10E
R74
33K
R73
33K
+15VB
-15VB
+15VA
-15VA
GND
IN_A+
IN_A-
PARALLEL
SW1
STEREO
IN_B-
IN_B+
GND
POT A
DL4
POT B
DL2
C32
47U 25V
GND
GND
STEREO POWER AMP. PRL 500
C18
47U 25V
BRIDGE
SW2
PROEL S.p.A.

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TR25
MJ21193
TR26
MJ21193
TR18
MJ21193 TR17 MJ21193
TR34
MJE15031
TR31
MJ21194
TR32
MJ21194
TR23
MJ21194
TR24
MJ21194
TR33
MJE15030
R3
0.47E 3W
R58
22E 1W
R63
1K5 7W
R64
1K5 7W
R38
10E 2W
R26
0.47E 3W
R30 0.47E 3W R27 0.47E 3W
R29
0.47E 3W
R5
0.47E 3W
R6
0.47E 3W
R2
0.47E 3W
R34
22E 1W
R41
10E 2W
C1
3N3
C5
3N3
C9
1N5
C29
27P
C2
2N2
C3
33N
D5
1N4007
D12
1N4007
D14
1N4007
D19
1N4007
D4
1N5403
D17
1N4007
D6
1N4007
D3
1N5403
D15
1N4007
R40
47E
VR1
100E
R51
1K
R39
1K
R95
100E
R86 22K 1/2W
D13
3V9 1W
D18
4V7 1W
VR3
2K2
R35 NTC 50R
°C
R62
680E 5W
R77
75K 1%
C40
120N
R79
560E
R83
100E
D32
W02G
5
67
IC3-B
NE5532 3
21
8 4
IC3-A
NE5532
C30
47P
R76
10K
R75
10K
R78
6K8
JS6
D31
15V 1W
D25
15V 1W
C15
220U 25V
C28
220U 25V
C31
100N
C36
100N
-15VA
+15VA
+15VA
-15VA -VA
+VA
OUT_L
TR4
MJ21193
TR2
MJ21193
TR1
MJ21193
TR12
MJ21193
TR10
MJ21193
TR9
MJ21193
TR36
MJE15031
TR8
MJ21194
TR7
MJ21194
TR5
MJ21194
TR16
MJ21194
TR15
MJ21194
TR13
MJ21194
TR35
MJE15030
R15
0.47E 3W
R25
0.47E 3W
R31
0.47E 3W
R33
22E 1W
R70
1K5 7W
R72
1K5 7W
R28
0.47E 3W
R42
10E 2W
R1
0.47E 3W
R8
0.47E 3W
R4
0.47E 3W
R19
0.47E 3W
R32
0.47E 3W
R20
0.47E 3W
R7
0.47E 3W
R16
0.47E 3W
R37
22E 1W
R45
10E 2W
C7
3N3
C8
3N3
C12
1N5
C17
27P
C6
2N2
C4
33N
D10
1N4007
D8
1N4007
D7
1N4007
D30
1N4007
D2 1N5403
D29
1N4007
D11
1N4007
D1
1N5403
D23
1N4007
R44
47E
VR2
100E
R47
1K
R43
1K
R93
100E
R53
22K 1/2W
D9
3V9 1W
D22
4V7 1W
VR4
2K2
R36 NTC 50R
°C
R71
680E 5W
R52
75K 1%
C15
120N
R56
560E
R54
100E
D24
W02G
5
67
IC2-B
NE5532
3
21
8 4
IC2-A
NE5532
C23
47P
R60
10K
R59
10K
R65
6K8
JS3
D21
15V 1W
D20
15V 1W
C10
220U 25V
C11
220U 25V
C21
100N
C22
100N
-15VB
+15VB
+15VB
-15VB -VB
+VB
OUT_R
5
67 IC4-B
TL072
3
21
8 4
IC4-A
TL072
C33
4U7 25V
C34
47P
DL3
14
3 2
R82
2K2
R80
27K
1
2
3
CN4
R90
10K
R85
1K
R89
10K
R88
10K
R84
10K
C35
47P
C39 47P
D34
15V 1W
D35
15V 1W
D36
15V 1W
D33
15V 1W
1
2
3
CN7
1 2
3 4
5 6
7 8
910
11 12
13 14
CN3
C42
100N
C38
100N
C41
47U 25V
C37
47U 25V
R91
22E
R87
22E
-15VA
+15VA
5
67
IC1-B
TL072
3
21
8 4
IC1-A
TL072
C19
4U7 25V
C13
47P
DL1
14
3 2
R50
2K2
R48
27K
1
2
3
CN1
R69
10K
R57
1K
R68
10K
R67
10K
R55
10K C14
47P
C26 47P
D27
15V 1W
D15
15V 1W
D25
15V 1W
D26
15V 1W
1
2
3
CN2
C27
100N
C25
100N
C24
47U 25V
C20
47U 25V
R66
22E
R61
22E
-15VB
+15VB
JS1 JS4
JS2
JS5
R46
10E
R74
33K
R73
33K
+15VB
-15VB
+15VA
-15VA
GND
IN_A+
IN_A-
PARALLEL
SW1
STEREO
IN_B-
IN_B+
GND
POT A
DL4
POT B
DL2
C32
47U 25V
GND
GND
STEREO POWER AMP. PRL 900
C18
47U 25V
BRIDGE
SW2
TR28
MJ21193
R14
0.47E 3W
TR20
MJ21193
R13
0.47E 3W
TR21
MJ21194
R17 0.47E 3W
TR29
MJ21194
R18 0.47E 3W
PROEL S.p.A.

1 2 3 4 5 6
A
B
C
D
654321
D
C
B
A
Title
Number RevisionSize
C
Date: 23-May-2001 Sheet of
File: A:\PRL1300-900-500.ddb Drawn By:
TR25
MJ21193
TR26
MJ21193
TR18
MJ21193 TR27
MJ21193
TR28
MJ21193
TR17
MJ21193
TR19
MJ21193
TR20
MJ21193
TR34
MJE15031
TR29
MJ21194
TR30
MJ21194
TR31
MJ21194
TR32
MJ21194
TR21
MJ21194
TR22
MJ21194
TR23
MJ21194
TR24
MJ21194
TR33
MJE15030
R3
0.47E 3W
R24 0.47E 3W R18 0.47E 3W
R58
22E 1W
R63
2K2 7W
R64
2K2 7W
R21 0.47E 3W
R38
10E 2W
R14
0.47E 3W
R9
0.47E 3W
R13
0.47E 3W
R26
0.47E 3W
R30 0.47E 3W R27 0.47E 3W R17 0.47E 3W
R29
0.47E 3W
R5
0.47E 3W
R11
0.47E 3W
R6
0.47E 3W
R2
0.47E 3W
R34
22E 1W
R41
10E 2W
C1
3N3
C5
3N3
C9
1N5
C29
27P
C2
2N2
C3
33N
D5
1N4007
D12
1N4007
D14
1N4007
D19
1N4007
D4
1N5403
D17
1N4007
D6
1N4007
D3
1N5403
D15
1N4007
R40
47E
VR1
100E
R51
1K
R39
1K
R95
100E
R86 22K 1/2W
D13
3V9 1W
D18
4V7 1W
VR3
2K2
R35 NTC 50R
°C
R62
680E 5W
R77
75K 1%
C40
120N
R79
510E 1%
R83
100E
D32
W02G
5
67
IC3-B
NE5532 3
21
8 4
IC3-A
NE5532
C30
47P
R76
10K
R75
10K
R78
6K8
JS6
D31
15V 1W
D25
15V 1W
C15
220U 25V
C28
220U 25V
C31
100N
C36
100N
-15VA
+15VA
+15VA
-15VA -VA
+VA
OUT_L
TR4
MJ21193
TR3
MJ21193
TR11
MJ21193 TR2 MJ21193
TR1
MJ21193
TR12
MJ21193
TR10
MJ21193
TR9
MJ21193
TR36
MJE15031
TR8
MJ21194
TR7
MJ21194
TR6
MJ21194
TR5
MJ21194
TR16
MJ21194
TR15
MJ21194
TR14
MJ21194
TR13
MJ21194
TR35
MJE15030
R15
0.47E 3W
R25
0.47E 3W
R31
0.47E 3W
R33
22E 1W
R70
2K2 7W
R72
2K2 7W
R28
0.47E 3W
R42
10E 2W
R1
0.47E 3W
R8
0.47E 3W
R4
0.47E 3W
R23
0.47E 3W
R19
0.47E 3W
R22
0.47E 3W
R32
0.47E 3W
R20
0.47E 3W
R12
0.47E 3W
R7
0.47E 3W
R10
0.47E 3W
R16
0.47E 3W
R37
22E 1W
R45
10E 2W
C7
3N3
C8
3N3
C12
1N5
C17
27P
C6
2N2
C4
33N
D10
1N4007
D9
1N4007
D8
1N4007
D30
1N4007
D2 1N5403
D29
1N4007
D11
1N4007
D1
1N5403
D23
1N4007
R44
47E
VR2
100E
R47
1K
R43
1K
R93
100E
R53
22K 1/2W
D8
3V9 1W
D22
4V7 1W
VR4
2K2
R36 NTC 50R
°C
R71
680E 5W
R52
75K 1%
C15
120N
R56
510E 1%
R54
100E
D24
W02G
5
67
IC2-B
NE5532
3
21
8 4
IC2-A
NE5532
C23
47P
R60
10K
R59
10K
R65
6K8
JS3
D21
15V 1W
D20
15V 1W
C10
220U 25V
C11
220U 25V
C21
100N
C22
100N
-15VB
+15VB
+15VB
-15VB -VB
+VB
OUT_R
5
67 IC4-B
TL072
3
21
8 4
IC4-A
TL072
C33
4U7 25V
C34
47P
DL3
14
3 2
R82
2K2
R80
27K
1
2
3
CN4
R90
10K
R85
1K
R89
10K
R88
10K
R84
10K
C35
47P
C39 47P
D34
15V 1W
D35
15V 1W
D36
15V 1W
D33
15V 1W
1
2
3
CN7
1 2
3 4
5 6
7 8
910
11 12
13 14
CN3
C42
100N
C38
100N
C41
47U 25V
C37
47U 25V
R91
22E
R87
22E
-15VA
+15VA
5
67
IC1-B
TL072
3
21
8 4
IC1-A
TL072
C19
4U7 25V
C13
47P
DL1
14
3 2
R50
2K2
R48
27K
1
2
3
CN1
R69
10K
R57
1K
R68
10K
R67
10K
R55
10K C14
47P
C26 47P
D27
15V 1W
D15
15V 1W
D25
15V 1W
D26
15V 1W
1
2
3
CN2
C27
100N
C25
100N
C24
47U 25V
C20
47U 25V
R66
22E
R61
22E
-15VB
+15VB
JS1 JS4
JS2
JS5
R46
10E
R74
33K
R73
33K
+15VB
-15VB
+15VA
-15VA
GND
IN_A+
IN_A-
PARALLEL
SW1
STEREO
IN_B-
IN_B+
GND
POT A
DL4
POT B
DL2
C32
47U 25V
GND
GND
STEREO POWER AMP. PRL 1300
C18
47U 25V
BRIDGE
SW2
PROEL S.p.A.