Crest 4801 set, 4801 Preamp User Manual
8
7
6
5
4
3
2
1
D3
R3
330K
1N4148
Q3
2N5401
R1
15K
D D
VCC-
13
12
11
10
J2-M
9
8
7
6
5
4
3
2
1
10K 0.2%
R9 A
R9 C
0.1uF
C5
D5
1N4148
10K 0.2%
R10
C C
20K 1%
R9 D
10K 0.2%
C8 2.2uF 5%
R25
150K
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
J3-M
B B
D10
1N4148
C12
1/50V
R34 10K
D12 1N4148
R33 100K
D13 1N4148
R31 10K
C13
1/50V
SIGNAL DETECTOR LIMIT DETECTOR
VCC+
R6
22K
R2
10K
Q4
2N5551
R4
4.7K
C2
100uF 35V
D4
1N4148
R20
Q1
2N5551
R15
4.7K
D21
1N4148
10K
TURN ON DELAY/MUTE
VCC+
D9
1N4148
D6
1N4148
C3
30pF
6
5
D8
1N4148
C6
0.1uF
10K 0.2%
-
+
LF353N
R17
100K 1%
C4
30pF
R9 B
IC1 B
7
VCC-
R16
2
3
2 1
4 6
200K 1%
-
+
LF353N
8 4
OC1
5
CLM5010
VCC-
-
6
1
IC1 A
VCC+
IC4 B
LM393N
7
+
5
BALANCED INPUT/GAIN
R26 4.7K
VCC-
-
2
1
+
D11
1N4148
3
IC2 A
RC4559N
8 4
VCC+
R45
2.2K
SERVO/HIGH PASS CURRENT LIMITER
C9
2.2uF 5%
R27
10K
R28
549 1%
IC4 A
LM393N
1
C11
VCC-
-
2
+
3
8 4
VCC+
0.001uF
R24
R52
1K
1K
VCC+
R35
680K
R19
1K
5
+
7
6
-
IC2 B
RC4559N
R18
4.7K
R21
10K
R22
180K
R7
220K
D28
1N4148
VCC+
R23
10K
84
3
+
1
2
-
IC3 A
RC4559N
VCC-
7
IC3 B
RC4559N
VCC+
D7
1N4148
R32
680K
VCC-
NOTE 1: 8.2K 2W ON MODELS 8001, 7001, CV601/600
6.8K 2W ON MODELS 6001, 4801
VCC+
Z1 1N5353
C17 470uF
R65
C14 470uF
NOTE 3
C22
0.47uF 250V
R70
C19
511 1%
R69
NOTE 1
0.1uF
R55
SELECTED
R54
100K 0.1%
R58
1K 0.1%
R57
1K 0.1%
VCC-
R56
100K 0.1%
Z4 1N5938
Q5
2N5551
Q7
2N5551
R72
68.1 1%
R71
100
R75
8.25K 1%
Q6
2N5551
2N5551
Q8
R73
68.1 1%
R74
100
D22
1N4148
D23
2N5401
C23
0.1uF
C26
1N4148
R77
100
R78
68.1 1%
Q9
2N5401
Q11
R82
511 1%
R76
8.25K 1%
R79
68.1 1%
2N5401
Q10
Q12
2N5401
R81
NOTE 1
R80
100
R66
NOTE 3
VCC-
R90
4.7K
R61
1K 0.1%
R63 100K 0.1%
R62
SELECTED
-
6
+
5
D27
1N4148
R60
1K 0.1%
D26
1N4148
R59
100K 0.1%
VCC+
R47
1M
R46
100K
Q15
2N5551
R50
2.2K
Z6 1N5938
0.47uF 250V
C15 470uF
C18 470uF
Z2 1N5353
CLIP DETECTOR AMPLIFIER FRONT END/IC POWER SUPPLY
Q13
2N5551
D24
SF14
R87
NOTE 2
R89
2.7K
R85
11K 1% 1W
R86
549 1%
R88
NOTE 2
D25
SF14
Q14
2N5401
R83
47
C27
30pF
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
J1-F
R84
47
5.6K 2W ON MODELS CC301/300
3.3K 2W ON MODELS CV301/300, CC151/150
NOTE 2: 27K 2W ON MODELS 8001, 7001, CC601/600
A A
20K 2W ON MODELS 6001, 4801, CC301/300
15K 2W ON MODELS CV301/300, CC151/150
NOTE 3: 1K 10W ON MODELS CC151/150, CV301/300
820 10W ON ALL OTHER MODELS
CREST AUDIO
150 Florence Ave.
Hawthorne, NJ 07506
Title
PREAMP/FRONT END
Size Document Number Rev
2123001
C
8
7
6
5
4
3
Date: Sheet of
2
1 0Wednesday, May 17, 2000
1
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