Crest audio RA User Manual
EACH K1058 MOSFET
TO GIVE 300mV +/- 10mV
C20
100NF/
100V
C21
OPT
1N4148
D1
R24
150R
R25
2K7
R27
680R
R29
82K
GATE RESISTORS R127 - R132
R144
22R
LABEL
HT+
LABEL
LT+1
F
C17
LABEL
LABEL
AMP1
GND1
C18
C33
R11
1K
C22
220PF
R37
OPT
100NF/
250V
1N4148
R50
OPT
C34
OPT
D2
R34
39K
Q1
BF423
R32
220K
Q2
BF422
D3
1N4148
D4
1N4148
Q3
BF422
VR3
470R
Q5
BC184L
R52
330R
R33
100R
R44
100R
Q7
BC214L
Q9
BF423
R46
100R
R45
100R
R53
2K7
R47
100R
R48
100R
R55
680R
Q4
BF422
Q6
BC184L
Q8
BC214L
Q10
BF423
R31
100R
R28
100R
R35
100R
R49
100R
R56 100R
R51
100R
Z3
6V2
Z4
6V2
R57
82K
C24
100UF/
16V
100UF
C29
100UF/
16V
C31
OPT
R60
OPT
C25
25V
/
Q11
BF422
100NF
R36
1K
Q14
BF423
R59
39K
C23
R38
220K
VR1
1K
R39
5K6
R40
1K5
Q12
BF423
Q13
BF422
Q15
BF422
C30
100NF
R71
47R
C28
100UF
Z5
D5
1N4148
D6
1N4148
Z6
Q16
BF422
Q19
BF423
IN4004
D28
IN4004
D29
BF422
Q17
R30
1K
R58
1K
Q18
BF423
R127
560R
R128
560R
A
R43
330R
R41
220R
R42
220R
B
R115
560R
GATE RESISTORS R115 - R120
R116
560R
D19
IN4004
D20
IN4004
CHOKE1
15 TURNS
R73
10R/2.5W
R72
10R/2.5W
C42
100NF/250V
R143
22R
LABEL
O/P1
R146
10R/2.5W
C41
100NF/250V
LABEL
GND
LABEL
LT-1
LABEL
HT-
E
D
C
B
DIAGRAM SHOWS RA1000 OUTPUT
STAGE. RA2000 AND RA3000
OUTPUT STAGES DIFFER IN THE
NUMBER OF OUTPUT DEVICES PER
RAIL. THE RA2000 USES 4 DEVICES
PER RAIL AND THE RA3000 USES 6
DEVICES PER RAIL. ADDITIONAL
OUTPUT DEVICES ARE
CONFIGURED SIMILARLY WITH
560R GATE RESISTORS AS SHOWN.
Title
A3
Date: 1-Jul-1999 Sheet of
ON AMPLIFIERS WITH FLAT PACK
(J162 K1058) MOSFETS
FIT A 10pF >=250V WORKING
ACROSS THE GATE, DRAIN OF
QUIESCENT VOLTAGE ADJUSTMENT
THIS IS MEASURED ACROSS THE
GATE DRIVE AT POINTS A B
CHANNEL 1 AMPLIFIER
Number RevisionSize
A
3RAMAIN 2
62
TO GIVE 300mV +/- 10mV
EACH K1058 MOSFET
C63
100NF/
100V
C62
OPT
D17
1N4148
R114
150R
R113
2K7
R111
680R
R109
82K
GATE RESISTORS R133 - R138
R145
22R
LABEL
HT+
LABEL
LT+2
F
100UF/100V
LABEL
LABEL
100UF/100V
AMP2
GND2
C66
C65
R88
C61
220PF
100NF/
250V
C52
1K
R103
OPT
1N4148
R100
39K
R85
OPT
C51
OPT
D18
Q44
BF423
R102
220K
Q43
BF422
D15
1N4148
D16
1N4148
VR4
470R
R84
330R
Q42
BF422
Q40
BC184L
R101
100R
R89
100R
Q38
BC214L
Q36
BF423
R92
100R
R93
100R
R83
2K7
R91
100R
R90
100R
R81
680R
Q41
BF422
Q39
BC184L
Q37
BC214L
Q35
BF423
R104
100R
R110
100R
R99
100R
R87
100R
R80 100R
R86
100R
Z11
6V2
Z10
6V2
R79
82K
C60
100UF/
16V
100UF
C54
100UF/
16V
C47
OPT
R76
OPT
C56
25V
/
Q34
BF422
100NF
R98
1K
Q31
BF423
R77
39K
C59
R97
220K
VR2
1K
R96
5K6
R95
1K5
Q33
BF423
Q32
BF422
Q28
BF422
C50
100NF
C55
100UF
Q30
BF422
Z8
D13
1N4148
D14
1N4148
Z9
Q26
BF423
D32
IN4004
D31
IN4004
Q29
BF422
R108
1K
R78
1K
Q27
BF423
R133
560R
R134
560R
A
R106
330R
R94
220R
R107
220R
B
R121
560R
GATE RESISTORS R121 - R126
R122
560R
D21
IN4004
D22
IN4004
CHOKE2
15 TURNS
R75
10R/2.5W
R74
10R/2.5W
C43
100NF/250V
R142
22R
LABEL
O/P2
R147
10R/2.5W
C44
100NF/250V
LABEL
GND
LABEL
LT-2
LABEL
HT-
E
D
C
R105
47R
DIAGRAM SHOWS RA1000 OUTPUT
STAGE. RA2000 AND RA3000
OUTPUT STAGES DIFFER IN THE
NUMBER OF OUTPUT DEVICES PER
RAIL. THE RA2000 USES 4 DEVICES
PER RAIL AND THE RA3000 USES 6
DEVICES PER RAIL. ADDITIONAL
OUTPUT DEVICES ARE
CONFIGURED SIMILARLY WITH
560R GATE RESISTORS AS SHOWN.
Title
A3
Date: 1-Jul-1999 Sheet of
ON AMPLIFIERS WITH FLAT PACK
(J162 K1058) MOSFETS
FIT A 10pF >=250V WORKING
ACROSS THE GATE, DRAIN OF
QUIESCENT VOLTAGE ADJUSTMENT
THIS IS MEASURED ACROSS THE
GATE DRIVE AT POINTS A B
CHANNEL 2 AMPLIFIER
Number RevisionSize
B
A
3RAMAIN 3
63
MC33079 IC IS FITTED TO POSITION IC1
RA1000/1 R10, R23 4K7/1W
XLR1
C7 10PF
LABEL
HT+
JACK1
NOTE:- FOR AMPS WITH FLAT PACK MOSFETS
1
R12 10K
R10
F
XLR2
4 11
IC1A
MC33079
1
3
R1 1K R2 9K1
2
BLUE
RED
SCR
COAX2SYMCOAX2SYM
2
3
R3 1K R4 9K1
10PF
220PF
C2
C1
220PF
C3
R5
10K
2
3
C6
100UF/16V
R6
100K
R7
1K
COAX2SYM
C4
100UF/16V
R9
100K
R13 100K
6
5
R8
47K
C9 10PF
IC1B
MC33079
7
C15
100UF/16V
R22
100K
Z1
18V
Z2
18V
C5
100UF/25V
LABEL
GND
C16
100UF/25V
E
1
RED
SCR
BLUE
9
10
SEE NOTE:-
IC1C
MC33079
COAX2SYM
8
VOL1
50K LIN
R23
LABEL
HT-
LABEL
AMP1
D
XLR3
XLR4
LABEL
GND1
C8 10PF
2
R14 10K
3
R15 1K
R16 1K
1
COAX2SYM COAX2SYM
BLUE
RED
SCR
1
C11
220PF
3
R17 9K1
R18 9K1
C12
10PF
C10
220PF
R19
10K
13
12
IC1D
MC33079
14
C13
100UF/16V
R20
100K
R21 1K
COAX2SYM
C14
100UF/16V
BRIDGE/STEREO
COAX2SYM COAX2SYM
RED
BLUE
SCR
MODE SWITCH
RA3000/1 R10, R23 6K8/1W
RA2000/1 R10, R23 6K8/1W
COAX1SYM COAX1SYM
RED
SCR
LABEL
AMP2
LABEL
GND2
C
SW2
B
2
RED
SCR
JACK2
RGND 10R/2.5W
GREENGREEN
BLUE
COAX2SYM
SW1
REDYELL
LABEL
LT+
LABEL
LEDBR
RA INPUT PCB
GROUND LINK
SWITCH
VOL2
50K LIN
Title
A3
INPUT STAGE CIRUITRY
Number RevisionSize
RAMAIN 1
Date: 1-Jul-1999 Sheet of
A
3
1 6
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