When replacing the output transistors, clean all foreign
matter from the heat sink, insulator, and transistor. Brush a
generous amount of silicon compound such as Dow Corning
No. 340 to completely cover both surfaces of the insulator
(Part No. 16-9278-01). Place the insulator between the heat
sink and the replacement transistor. Use the original transis-
tor mounting hardware to mount the replacement transis-
tor.
The above procedure may require some dismantling of
the heat sink. It is therefore important to also clean the
contact surface of the thermal breaker and to apply the
silicon compound to the thermal breaker before reassem-
bling the heat sink. Make certain the thermal breaker makes
firm contact with the heat sink.
REPLACEMENT PARTS
Most components used in the amplifier are standard
parts available through reputable parts suppliers. The parts
listed here may be obtained from Bogen d i s t r i b u t o r s ,
service agencies or directly from the factory. When ordering
a part, specify a part number, the model of the unit, and
give the series designation, which is a letter followed by
numbers, printed on the chassis. For parts on circuit
boards, also give the component board assembly number,
which begins with “45”.
When replacing transistors, use those made by the
specified manufacturers. Transistors from other suppliers
may not be satisfactory. Certain resistors must be Allen-
Bradley products. These are designated by “AB” on the
schematic diagram.
Ref. No. Part No. Description
A3 45-9813-01
C3,19
79-008-049
C5, 17,18 79-008-057
Cl5
79-504-032
C25
79-l 12-001
c 2 9 79-008-058
c31
79-008-062
CRl, 2, 6 96-5333-01
CR3 96-5344-04
CR4
96-5344-02
CR5 96-5202-01
Ll-3 95-5 162-01
L4
95-5 163-01
95-5164-01 96-5213-01
96-5346-01
96-5 96-5298-01 176-01
Q10
96-5283-01
Q11
96-5357-01
Q12
96-5356-01
Rl
77-001-712
R23 77-00 l-709
R32 77-001-722
R48 75-842-561
R65, 69 76-107-096
R67, 68 76-116-003
PC board assembly
Capacitor, electrolytic, 500µF, 35V
Capacitor, electrolytic, 50µF, 50V
Capacitor, tantalum, 2.2µF, 15V
Capacitor, electrolytic, 500µF, 75V
Capacitor, electrolytic, l0µF, 50V
Capacitor, Electrolytic, 1 OOµF, 50V
Diode, 400 piv @ 1 A
Diode, zener, 18V, 2W
Diode, zener, 12V, 2W
H V R 3
Inductor, 150µH
Inductor, 50µH
Inductor, 1 5µH
Transistor, 2N5089 or
Transistor, BC 239C
Transistor, MPS-65 18
Transistor, SPS-1910
Transistor, MPS-A55
Transistor, 2SD-389 (P)
/2SD313D/TIP31A
Transistor, 2SB-5 12 (P)
/2SB507D/TIP32A
Control, aux vol., 2 megohm
C.T.
Control, comp., 50 kilohm
Control, master vol., 10
kilohm
Resistor, 560 ohm, 3W
Resistor, .82 ohm, 2W
Resistor, .27 ohm, 7W
Schem. Ref. Part No. Description
Chassis electrical components
C l 0 6
79-509-05 1
Cap, electrolytic, 1500µF,
79-509-052
79-509-053
C l 0 7 79-509-O 15
79-509-O 17
79-509-O 19
CBlOl
94-00 17-04
94-00 17-09
94-00 17-15
CB-102 94-00 14-07
CR-101, 102 96-5241-01
CR-103, 104 96-5333-01
1101 94-0302-05
QlOl-106
96-5385-01
96-5397-01
RlOl-105
R108
R109, 110
SW101
TlOl
77-001-723
75-741-101
76-116-003
T102
81-003-057
81-003-053
83-805-000
83-804-000
83-803-000
83-422-000
83-423-000
83-424-000
75V (CT-35)
Cap, electrolytic, 2000µF,
75v (CT-60)
Cap, electrolytic, 3000µF,
75V (CT-l00)
Cap, electrolytic, 750µF,
5OV (CT-35)
Cap, electrolytic, 1500µF,
5ov (CT-60)
Cap, electrolytic, 2500µF,
50V (CT-l00)
Circuit breaker, .93A hold
(CT-35)
Circuit breaker, 1.65A hold
(CT-60)
Circuit breaker, 2.5A hold
(CT-l 00)
Thermal breaker, 105°C
Diode, 300 piv @ 3A
Diode, 400 piv @ 1A
Pilot lamp assembly
Transistor, 2N3055H RCA
(CT-35,60)
Transistor, 2N3055 Solitron
(CT-l 00)
Control, slide, 500 kilohm __
Resistor, 100 ohm, 7W
Resistor, .27 ohm, 7W
(CT-l 00)
Switch, ac, 3A (CT-35,60)
Switch, ac, 6A (CT-l00)
Transformer, power (CT-35)
Transformer, power (CT-60)
Transformer, power (CT-l00)
Transformer, output (CT-35)
Transformer, output (CT-60)
Transformer, output (CT-l00)
Pre-amp board components
Al, A2
C4,13
Q1,2
45-7082-01
PC board assembly
79-008-05 1 Cap, electrolytic, 2 5 µ F 35V
96-5213-01 Transistor, 2N5089 or
96-5346-01 Transistor, BC 239C
Rl,
2,
15, 16 76-147-126 Resistor, 4.7 ohm, 1/2W
R14,25
77-001-711 Control, 1 megohm
Mechanical components
03-0628-02
Control, anti-feedback
03-0593-01 Control, aux 1, 2 vol.
03-0641-01 Control, mic 1, 2 vol.
03-0592-01 Control, master vol., comp.,
mic 3,4