Altec 1590B User manual

SPECIFICATION S
Type:
Gain:
Input Sens iti vity:
Power Output:
Frequency Response:
Input Impedan ce:
Source Impedance:
Load Impedance:
Load Vo ltage:
Output Impedanc e:
Noise Leve l:
Operating Temperat ure :
Controls:
Power Supply:
OR
Dimensions:
Weight:
Accessories :
Power amp Iifier
67 dB
0.8 vo lt for rated output
200 wat ts at less than 1.0 % THD,
50 - l2,000 Hz
±l dB, 20 - 20 , 000 Hz
15 ,000 ohms
150and 600ohms(withA LTEC 15095
Line Transformer)
6. 25/ 8 and 25/ 32 ohms
35 and 70 vo lts
Less than 25% of nomina I load imped-
ance
Output noise 85 dB be low ra ted out-
put
Up to 55° ce nti grade (13 1° Fahren -
heit)
Vo lume Contro l, continuous ly var i-
a ble composit ion
Power Switch
High-P ass Filte r Switch
l20/ 240V ac, SO/ 60 Hz
25 watts at zero signa l leve l
260 wa tts at 70 watts output leve l
420 watts at 200 wa tts output level
24/ 28V de (Battery (-) Ground)
0.2 amps at zero signa l leve l
8 amps at 70 watts output level
14 amps at 200 watts output leve l
10-1 / 2" H x 19" W x 8-1 / 4" D
41 pound s
ALTEC 15095 Line Transformer
ALTEC 15335 Bridging and Match ing
Transformer
ALTEC. 1590B
POWER AMPLIFIER
OPERATING
INSTRUCTIONS
Spe cial Features: l. Automatic transfer from ac ta de source
in event of ac power failure. Trickle
charge to main ta in battery pro v ided when
ac operation is used.
DESCRIPTION
2. An active dissipation-sensing circuit
providing protection to the output tran-
sistors. Should a ma Ifunction occur, or
the load represent a severe downward
mismatch in the presence of high level
program material, the sensing circui ts
pre vents the output transistors from
operating in a mode which would cause
damage or degradation. As the action
of the circuit is immediate and effective,
on ly that port ion of the program material
which would damage the transistors is
limi ted. The amplifier recovers its
normal function as soon as the output
fault is remo ved.
3. High-pass filter for use in speech sys-
tems. Approximate cutoff frequency,
500 Hz. Chassis mounted continuo usl y
variable composition gain control.
4 . Safety - Under wr ite rs' Laboratories
Listed
The ALTEC 1590B Power Amp lifier is an improved version of
ALTEC's 1590A Power Amplifier, designed for applications
where uninterrupted operation is required. Solid-state, 100%
silicon, the amplifier provides 200 wa tts of power at less than
1.0 % total harmonic distortion from 50 to 12,000 Hz.
SpcciJi cal'ions <ind rom})onc11ls s11f,j1·d lo cha ·11,t1c 111it houl
notic e. Ov<!ntlf pcrfor111a11c c will /Jt' m11inlainr ·d or imJ}rov ccl.
ALTEC. 1515 S. Manchester Ave., Anaheim, Calif. 92803 42-02-041977-07
SOUND PRODUCTS DIVISION Lithe in USA CP-875-2 .SK

Capable of operation from a 120 or 240 volt ac source or a
negative grounded 28 vo lt de source, the ALTEC 1590B is im-
mune to power failure. Incorpo rated in the amplifie r is a 'Fail
Safe', silent, automatic transfe r to de operation in th e event
of power fai lure. When ac power is restored, the amp Iifi er wi 11
automa tica Ily transfer ba ck to the ac source and pro vide a fIoat
charge to the de battery, returni ng the batter y to a full y charged
state.
Figures l , 2 and 3 show per formance characteris t ics of the
1590B.
Frequency response of the ALTEC 1590B Power Amp Iifier is ±l .0
dB 20 to 20,000 Hz . Th e ALTEC 1590B Power Amplifier also
contains a highpass filt er for use in speech system s, a high in-
put impedance of 15, 000 ohms , with an octal socket provided
for plug-in transformer to inpu t line isolation.
Featured with the ALTEC 1590B Power Amplifier is the ex clu-
sive dissipation-sensing c ircuit , providing protection to the out-
20
WAT
I /.,.
250 L?,AD
0 '\_ l
hi
TS 15908
put transistors. If a malfunction occurs, or if the load re-
presents a severe downward mismatch in the presence of high-
level program material, the sens ing circu it prevents the output
transistors from operating in a mode which would cause damage
or degradation. Because the act ion to the ci rcuit is immediate
and effective a tall frequencies within the passband of the amp Ii-
fier, only that p ortion of the program mat erial which wou ld
cause damage t o the transistors is limited. The amplif ier re-
covers its norma l functionas soon as theoutp utfault is removed.
The ALTEC 1590B Power Amp Iifier, designe d for rack mounted
use, occupies only 6 units of rack space, and allowseasyaccess
to components via the hinged front pane l . All circuitry is ac-
cessib le for servicing when the front panel is open without re-
moving the amplifier from the rack. A pr inted circu it board
(PCB), plugged into a receptacle contains a ll active inputand
driver circuitry . Output trans istors and assoc iated drivers are
mounted on a massive heat sink assembly whic h unplugs from
the rear of the chass is when the protective shroud is removed.
...
~
"~
IJ WATTS VS FREQUENCY@ 1% THO 70V LINE \
10
0
5
0
0
B
+5
d
0
-3
10
J
, ~
'-320 LOAD
1,/
FREQUENCYRESPONSE@ 2.5 WATTS
20 30 40 50 100 500 1 KHz 5 KHz 10 KHz 20 KHz 50 KHz
FREQUENCYIN HERTZ
Figure l. Power and Frequency Response Cha racteristics
5%
4
I I l I I I
THOVS WATTS@ 1 KHz
I
2
0 I 10 WATTS 100 500
Figur e 2. Distortion / Power Characteristics
-2-

5% I I I 1111 I I I
1590B
I I I DISTORTION VS FREQUENCY
t-o-lOOW 25Q
4%
3%
THD i,,200W 25Q LOAD
' ; 200W 32Q LOAD
2%
~
~20o w 32Q -~
1% \ J
,.....-2oow 25Q
1 // I I I
\. \ ......-1oow 25Q
"~
t,.,._
0
~~
20 30 40 50 100 200 l K
FREQUENCYIN HERTZ 10 K 20 K
Figur e 3. Distortion / Frequ ency Characteristics
POWER CONNECTIONS
120 volt, 50/ 60 Hz: Equi pment supplied for domesti c use will
have the power transformer primary strapped for 120 vo lts, (ter -
minals l to 2 and 3 to 4 on TB3). The power input nameplate
on the chass is adiacent to the power cord wi11be mounted to
show the appropriate side speci fying the co nne c tions .
240 volt , 50/ 60 Hz: Export equ ipment, so spec ified , wi11 ha ve
the powe r transformer pr ima ry strapped for 240 vo lts operat ion
(termina ls 2 to 3 on TB3). The power inpu t namep late on the
chassis adiacent to the power cord wi11be mounted to show the
appropr iate side spe c ifying the co nnect ions .
Battery Operation: If desired , the 1590B may be co nnec ted to
an exte rnal 24/28vo ltdc (- ) ground (battery) powe r source.
Terminal s for the de power connections are located on the rear
panel.
When the amplifier is connected to an ac source , the batter y
will receive a 'float' charge of ap prox imatel y 100 mA keeping
it charged. Shou ld an ac power failure occur or the acswitch
be turned off, immedi a te and silent transfer to the de source is
accomplished. Whe n the amp Iifier is operating from the de
sourc e , the pi lot lamp wi 11be off. With the restoration of ac
power, the pilot lamp wi ll again be on, and bat tery charging
wi11resume.
-3-
INPUT CONNECTIONS
There are two pairs of input ter minal s on the amplifier. Ter-
minals l and 2 which con ne c t d irect ly to the input potentio-
meter, are used for unbalanced high impedance sources or for
bridging unb a lanc ed low impedan ce lin es which ha ve a signal
vo ltage of l volt or more. Terminal s 3 and 4, whi ch connect
to a standard octa l socke t, are used for low impedan ce (150 or
600 ohm) source s when transformer isolati on is required. Ter-
mina l 2 is used to co nnect the sh ie ld of the inco ming Iine. The
ALTEC 15095 Line Transformer must be used in the octal socket
~
IQ)
MADE IN USA ~
G
l0:<¼?/Hz
0I
260WATTS
!?)
24/28V BATTERY REPL ACE WITH
CHARGINGRATE 0.2A THE SAME TYPE
+ - <+-) IOAGC·,2 V FUSE
• BATTERY
Figur e 4. Powe r Connections

for this connection. The octa l socket is strapped for 600 ohm
operat ion. The 150 ohm input is obtained by strappin g the socket
terminal s as shown on the schematic . Both input s may be used
simultaneousl y if isolation res istors are insta lled in e i ther or
both input Iines as requir ed to preve nt o'n e sourc e from short-
circuiting the othe r . Figu re 5 illustrate s the input connec -
tions.
OUTPUT CONNECTIONS
Output connections are iIlustrat ed in Figur e 7 and on the tran -
sistor protective shroud on the rear of the amp Iifi er . Use the
output tap which matches the total speaker impeda nce. If the
tota I speaker i mp e d a n c e fa Ils between two output ter mina I
values, use the lower impedan ce termina ls . If a severe mis-
match is unavoidable , or if a lower impedance is not a vai labl e ,
useanALTEC 15067Autot ransfo rmer toa c hiev e a pro perma tch.
HI PASS
FILTER
IN
0
~
15095
TRANSFORM ER
1 2 3 4
INPUT-
~~
(SHIELD IF USED)
UNBALANCED BALANCED
HIGH IMPEDANCE OR { ) WITH 15095 TRANSFORMER
BRIDGI NG LOW IMPEDANCE STRAPPEDFOR 1500 OR 6000
LINES (MIN . LEVEL I VOLT) (SEE SCHEMATIC)
FOR 1500 : STRAP SOCKET
TERMI NA LS 1- 4 & 3- 6
FOR 6000: STRAP SOCKET
TERMINALS 3- 4
Figure 5. Input Connections
The 70-vo lt dist ribu tion system permits conn ecti ons to a large
number of speakers, each to operate at its individua I power
level without the necessity of computing impedances. In thi s
system each speaker is equipped with a trans former co ntain ing
a number of taps rated in term s of power. Se lect the tap which
gives the power des ired for that particular spea ker. The total
power sett ings far a ll speakers should be equ al to, or less than,
the amp Iifier powe r rating . The 1590 8 Po w er Amp Iifier is
equipped with output to dri ve both a 70- vo lt (25/ 32 ohm) line
and a 35-vo lt (6.25 / 8 ohm) line.
HIGHPASS FILTER
A highpass filte r is incorporated fo r use in voice frequenc y
·systems where low frequency reproduction (be low 500 Hz) is not
required. The integral highpass fi lteriscon tro lled byanON-
OFF slide switch located abo ve the input ter minal s and next to
the 15095 Transfor mer socket. A moveable safety plate, fur-
nished with the filter switch, may be used to lock the switch
in either position .
VEN TILATION
The 15908, an al I-transistor amplifier, gene ra tes a minimum of
heat during norm □ I usage. Al though the amount of heat is re-
latively low , the amp Iifier must be ventila ted to prevent a tem-
perature rise. Becau se transistors are heat sensitive, the am-
plifier shou ld not beplac ed ad ja cen t toheat - generatingequip-
ment, or in ar eas whe re the ambient tempe rature exce ed s 55°
centigrade (131° Fahr enhe it ) . The protecti ve shroud, mount ed
over the transis tor heat sink, act s a s a heat - ex tracting venti-
lat or. The output transi stor cases, which ar e protected by th e
prot ective shroud , have ac and de vo Itag es on them. Therefore,
the protective shroud should not be removed from the amplifier
when .the ampli fier is in operation .
------I MPORTANT ---------,
The 15908 must be mounted so tha t both top
an d bottom of the heat sink are unobstructed
for air passage .
The temperatur e rise from bottom to top of the shroud is 40° C
when the amp Iifier is being driven. If one is mounted abo ve
the other in a rack, space must be provid ed between units or
the upper amp Iifier wi11 become too hot.
OONOlontA.I(
W1IH THI~StllOUD UMOVfD
SIUPf'!NGfOl
OUTl"UICONN!CIION~
' ' '
C~IU13:J
0.,lr,$$ 11WI.INC,IIV,.'fl{
uu:0,0lsrtN<Us
Figur e 6 . Rear View of 15908 Power Amplifier
- 4-

25/ 320 (70V)
l~l
6.25/ 80 (35V)
r LOAD 7
~
el el
~
1 3 2 4
OUTPUT~
-
I®
r fl
Figure 7. Output Connections
If the 1-3/4 " perforated panel (10399) is used between two
amplifiers, the inlet air temperature for the upper amplifier
will be 27° C above the cabinet ambient. If the cabinet am-
bient is 25° C the inlet air temperature will be 52° C and
within the amplifiers temperature rating of 55° C. If more
than two units are to be stacked, greater spacing will be re-
quired between units or the 1-3/ 4" panels can be used with a
single blower pressurizing the entire cabinet.
If there is any doubt as to inlet air temperature when several
amplifiers are mounted in a single cabinet, operate the system
until temperatures have stabilized and measure inlet air. This
can be done with a bulb type thermometer held at the bottom
of the heat sink shroud where the air enters. Care should be
taken to keep the thermometer bulb from touching metal which
will probably be hotter than air.
SERVICING
Should the amplifier bec ome inoperative, a check of de volt-
ages will aid in localizing the trouble. The schematic dia-
gram, Figure 9, indicates pertinent voltages and conditions
for their measurement.
If a malfunction occurs, service should be performed by an
ALTEC Qualified Service Representative. For foctory service,
ship the 1590B prepaid to Customer Service, ALTEC, 1515
South Manchester Avenue, Anaheim, California 92803. For
additional information or technical assistance, call (714)
774-2900, or TWX 910-591-1142.
ACCESS
Remove the four screws securing the front pane I, then open
and lower the hinged front panel to gain access to the chassis
interior.
- 5 -
OUTPUT TRANSISTOR MODULE
The output transistor module is a plug-in unit which is mount-
ed at the rear of the amp! ifier. Before checking the transistors
in this modul e, turn off the amplifier. Remove the protecti ve
shroud (four screws) and the two screws which hold the heat
sink assembly to the two standoffs. Remove the assembly from
the standoffs. The transistors now are accessible for removal
and checking with an ohmmeter or transistor tester.
------CAUTION----~
DO NOT operate the amplifier without
the shroud in place. It is a vital part
of the air passage in the heat sink.
RECOMMENDED SERVICE TECHNIQUES
If it becomes apparent through systematic troubleshooting that
a replacement of a component is necessary, a few precautions
must be obser ved .
Output Adjustment
Potentiomet er Rl 16 on the PCB is factory adjusted for minimum
distortion at 200 wa tts outpu_t at 1000 Hz. Should it become
necessary to replace one or more of the transistors Q3 to Ql6
inclusive, readjustment of Rl 16 may be required. If a distor-
tion analyzer is available, adjust Rl 16 for minimum distortion
of 200 watts output at 1000 Hz. If not, use an oscilloscope
and adjust Rl 16 for equal top and bottom clipping of the
waveform with th e amplifier being driven just to clipping at
1000 Hz .
Adjustment of Output "Q" Balance Controls
Output "Q" balance controls Rl35 and Rl36 on the PCB as-
sembly balance the bias current of output transistors Ql
through QB. Inadequate adjustment of these controls may re-
sult in distortion or excessive current drain from one or more
output transistors. If adjustment is indicat ed (such as replace-
ment of one or more output transistors), use the following rec-
ommended procedure:
Step 1. Turn VOLUME control fully counterclockwis e to (O).
Step 2. Remove four screws securing front panel, then lower
panel for access to interior.
~----CAUTION
High voltage may be encountered when
chassis is opened for service. This pro-
cedure should be referred to a qualified
service technician.
Step 3. Turn output "Q" balanc e controls R135 and R136
full y clockwise.
Step 4. Turn on power and allow a 5-minute warmup period.
Step 5. Adjust Rl35 and Rl36 by one of the following meth-
ods [method (a) is preferred].

(a) loca te wire attached to terminal 1 of output
transfor mer T2 (see Figure 9). Connect a clamp-
on mill iammeter to this wire and adjust R135
counte rc lockwi se for a "Q" current of 65 mA.
Change connection of miIIiammeter to wire at-
tached to term inal 3 of output transformer T2
and adj ust Rl36 for a "Q" curr ent of 65 mA.
Remove clamp-on miIIiammeter.
(b) Connect a milli voltmeter across resistor R9 (see
Figure 9), start ing with the highest scale to pro-
tect meter . Adjust Rl35 for meter reading of 10
mV. Change connection of milli voltme ter to
read across resistor RIO and adjust Rl36 for
meter reading of 10 mV. Remove millivolt-
meter.
Step 6. Close front panel and secure with four screws re-
moved in Step 2.
Transistor Orientation
Solid-state componen ts are packaged in various case sizes and
type s with various lead configurations. Typical solid-state
component orientatio ns are shown in Figure 8. Before remov-
ing a solid-state component from a PCB or tie points, sketch
the lead orientation with respect to the PCB or tie points.
Form the leads of the new component to conform with the
leads on the part bein g repla ced to aid in making proper con-
nect ions.
Before removing small "plug -in" transistors, note the position
of the index tab with respec t to the socket. Cut the leads of
the new transistor to the required length and insert them into
the socket properly indexed.
Replacing Power Transistors
Be sure the followin g condi tions exist when replacing power
transistors.
l. The mica insulat or is not damaged.
2. No grit or metal particl es are lodged between transistor
and heat sink.
3. Both sides of mica insulator are covered with silicone
grease or fluid.
4. Mounting screws are tig ht .
Testing Transistors
Transistors should be check ed with a transistor tester. If a
tester is not availabl e, an ohmmeter may be used because most
transistor failures result in a collector-to-emitter short oropen
circuit. Use the following procedure when testing transistors
with an ohmmeter.
Step l. Remove suspected transistor from circuit (see "Re-
placing PCB Components").
- 6 -
Step 2. Connec t ohmmeter leads to co llector and emitter and
read on lowest ohms scale. Reverse leads and read
agai n .
Step 3. If resistance reading is low and virtually unchanged
when ohmmeter connections are reversed, transistor
is short circuited.
Step 4. If ohmmeter indicates infinity on highest ohms scale
for both readings, transistor is open circuited.
Replacing PCB Components
Before removing and replacing component s on a PCB, observe
the following instructions.
Step l. Solid-state components and PCB's may be damaged
by excessive heat. Use a sma11soldering iron with a
1/8-inch diameter chisel tip and use small -diameter
60/ 40 rosin-cored solder.
Step 2. Remove components by placin g soldering iron on
component lead on conductor side of PCB and pu11
out lead. Avoid overheating conductor.
.------ CAUTION----~
The conductor on the PCB is a metal
surface plated with solder and laminat-
ed to the board. Too much pre ssure or
overheating may Iift the cond uctor from
the board.
Step 3. If component is faulty or damag ed, clip leads close
to component and then unsold er leads from board.
Withdraw leads from component side.
Step 4. Cle ar solder from circuit board ho les before inserting
lea ds of new component. Heat solder remaining in
hole , remove iron and quickly insert a pointed non-
metallic object, such as a tooth pick, from conductor
side.
Step 5. Shape new component leads and clip to proper
length. Lead shape shou ld provide stress relief for
component. Insert leads in holes, observing same
polarity or orientation of removed component. Apply
hea t and solder on conductor side .
Repairing Fractured or Damaged PCB Conductor
If a conductor is fractur ed, damaged or lifted from the circuit
board, a recommended method of repair is to solder a section
of good cond ucting wire along the damag ed area and then sea l
with epoxy.

Reference
Designator
None
None
Cl
C2, 110,
111
C3
C4
cs
ClOl
C102
Cl03
C104, 105
Cl 06, 107
C108, 109
CRl
CR2,3
CR4
CR5
CR6,7,8,
9, 10
CRlOl, 102,
103,104,
105, 106
Fl
F2
Pll
Ql,2,3,4,
5,6,7,8
QlOl, 103,
108,109
Ql02
Q104, 105
Ql06, 107
Rl
R2,3
R4,5,7,8,
9, 10
R6
& 0 0 Pin 2 - Emitter
T0-3 ©2 Pin 1 - Base
T0-66 0 1 MtgFlange - Collector
T0-5 DLead l - Emitter
Lead 2 - Base
Lead 3 - Collector & Case*
Index Tab
*Not all types. Somehave base-
to-case internally; others have
no connection to case .
Lead 1 - Emitter
TO-l 8 Lead 2 - Base
Lead 3 - Collector
Lead 4 - Connected to Case
Index Tab
T0-98
~
T0-92 ~
Lead E - Emitter
Lead C - Collector
Lead B - Base
Lead E - Emitter
Lead B - Base
Lead C - Collector
Figure 8. Typical Transistor Package Configurations
Ordering
Number
27-01-042080-01
27- 04-044777-0l
15-02- l00087- 01
15-02-100307 -0l
15-06-100157-01
15-01 - 100284-0l
15-01 - 100299-0l
15- 01- 100156-0l
15-02-107470-01
15-02-107532-0l
15-01-108543 -01
15-06 - l 02605-01
l5-02 - 100305-0l
48-0l-107429-01
48-01-042787-0l
48-01-107271 -0l
48-01- l08576-01
48-02-108690-0l
48-01-107017-0l
51-04 - l00469-01
51-04-105890 - 0l
39-01-100539-0l
48-03-040934-04
48-03- l01098-03
48-03-041440-02
48-03-119140-02
48-03-107447-03
47-06-042509 -01
47-0 l-100635-0 1
47-02-108691-01
47-01 - 100652-0l
PARTSLIST
Name and
Description
PCBassembly
Heat sink assembIy
Cap., 0. 02 µF ±20%, 100V
Cap., 0.01 µF ±20%, 100V
Cap., 1 µF ±10%, lOOV
Cap., 1000 µF, 35V
Cap., 13500 µF, 35V
Cap., l µF, 25V
Cap., 220pF ±10%, lOOV
Cap., 330pF ±10%, lOOV
Cap., 5µF, 25V
Cap., 0.47µF ±10%, lOOV
Cap., 0.005 µF ±20%,
lOOV
Diode, STB568
Diode, l Nl004 (selected)
Diode, Zener, 20V ±5%
Diode, Zener, 15V ±5%
Diode, rectifier, l N3492,
18A, 100 PIV
Diode, l N456A, 25V,
100 mA
Fuse, 4A, 125V, Slo-Blo
Fuse, lOA, 3AG
Pilot lamp, neon
Transistor, 2N6254
(selected)
Transistor, 2N2712
(selected)
Transistor, 2N3906
(selected)
Transistor, 2N5308
(selected)
Transistor, 2N5320, lOW,
75V (selected)
Pot., 15KD±20%
Res., 220±10 %, lW
Res., 0. 30 ±10%, S W
Res., l .8KD ±10% , l W
- 7 -
Reference
Designator
Rll, 12
Rl3
Rl4
Rl5
Rl6
RlOl
Rl02
Rl03, 106,
110
R104
R105
Rl07
Rl08, 109
Rl11, 112
Rl13, 131,
134
Rl14
Rl15,117
Rl 16,135,
136
Rl18, 119
Rl20, 123
R121, 122
R124
Rl25
Rl26, 127,
137,138
Rl28
R129, 132
Rl30, 133
Sl
S2A, 2B
Tl
T2
TlOl
TBl
TB2
TB3
TB4
Ordering Name and
Number Description
47-02 - 108692-01 Res., 10 ±10%, SW,
noninductive
47-01-10255 l-Ol Res., 4700 ±10%, lW
47-02-100715-0l Res., 2000±10%, SW
47-02 - 100713-0l Res., 470 ±10% , SW
47-01-102376-01 Res., 56KD ±10%, l/2W
47-0l-100479-01 Res. , 680 KD±10%, 1/4W
47-01-102190-0l Res. , 180KD±l0%, 1/4W
47-01 - 102171-0l Res., 4.7KD ±10% , 1/4W
47- 01-102168-0l Res., 2 .7KD ±l 0%, l/4 W
47-0l-102167-01 Res., 2.2KD ±l0 %, l/4 W
47-01 - 100477-0l Res., 470KD ±10%, 1/ 4W
47-01-102102-0l Res., lOKD ±5%, l/4W
47-0 1-102187-0l Res., 100KD ±l0% , l/4W
47-01 - 102177- 0l Res., l5KD ±10%, 1/4W
47-01-102165-01 R~s., 1.5KD ±10%, 1/4W
47-01-102140-01 Res., 100 ±10%, 1/4 W
47-05-014697 -0l Pot., SOD±20% , 2W
47- 01-102161-01 Res., 6800 ±10%, 1/4 W
47-01-100642-01 Res., 3300 ±10%, lW
47-01-102338-01 Res., 470 ±10%, 1/2 W
47-0l-102147-01 Res., 470 ±10%, 1/ 4W
47-0l-102062 - 01 Res., 2200 ±5%, 1/4W
47-01-102253-0l Res., 3600 ±10%, 1/ 2W
47- 01-102148-01 Res., 560 ±10%, l/4 W
47- 01-102081-01 Res., l .3KD ±5%, 1/4 W
47-01-102174-01 Res., 8 .2KD ±10%, 1/4 W
5l-02-100992-0l Switch, DPDT, slide
51-01-100988-0l Switch, 2-gang, rotary,
125V, 3A and 20V, SA
56-08-007062-11 Transformer, power
56-07-016732 - 04 Transformer, output
56-07 -015315-07 Transformer, driver
21-04 -1 01038-01 Termina l board, 4-terminal
21-04-101040 -01 Terminal board, 4-terminal
21-04-105882 - 01 Terminal board, 5-terminal
21- 04-101036-01 Terminal board, 2-terminal

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INPUT
TB I
f"ILTf.A IN
0 SI O l
OUT
TRANSFORMER
RECEPTACLE
15095
LIN E TRANSF()A MEA
15335
LINE STRAP
150n. 1-4,3 - 6
EiOOn. 3-4
BR:IDGING AND MATCHING TRANSFORMER
PRI SEC
1- 6 7-8
Q106 7
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7
CONNECT
LOAD
TO
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CUTP\JT STA:AP
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82 K
A l3 1
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5 CIRCLED NUMBERS(© ) IOENTln m· . ~ " -1o?-~ .,,_. ~ ;' ; ;.•'; /J.,., :
OINS OF HEATSINK CONNECTOR ❖ ❖ l 101 Y
ANO MATING CHASSIS CONNECTOR S ::::, ,.,.. <S- ~: ~- ~ :~ ~~ :
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3 UNDERSCORED VOLTAGES ARE J ~~- ~ j.. ''"" ...._,,. o,h -m)- 0
DC MEASURED TO GNO CCHASSISJ ~ -~~- j:-=.:::~o~(j -==-- ...,''''-
WITH AC LINE VOLTAGE t ~:. -:.·: --c=:!----c3i_ + ·u::&-..u.iW · -~
120V ZERO SIGNAL ~ ·':"::.~ ,..,.., ~ ~ A ~
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2 CAPA CIT OR VALUES A RE
IN MI CHOFARAD S
1 RESI STOR VALU ES ARE IN
OHMS \/~WATT 10%,
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Figure 9. Schematic (2D156- 10), 1590B Power Amp lifier
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