Altec 1593B User manual

ALTEC.
--- --------
VOLUII
• •
"... AL"TEC
.. ~ • 1
1~938
AMPLIFIER 2A-260V
.------NOT ICE--------,
Read thi s manual before operating
the ALTEC 1593B Power Amplifier .
FEATURES
1593B
AMPLIFIER
OPERATING
INSTRUCTIONS
• 50 Watts of Output Power at Less than 1% TH D from
45 Hz to 20 kHz • Automatic Transfer to Battery Operation if AC Power
Fails
• Transfo rmer-Isolated Outputs for 4, 8 and 16 Ohms and
for 70. 7V Distribution Systems • Low Power Consumption
• Low Heat Generation
• Switchable Highpass Filter Protects Driver Loudspeaker
from Excessive Low-Frequency Power Demands • Hinged Front Panel for Easy Maintenance
• Exclusive Active Dissipation Sensing Circuit Protect s
Output Transistors • Small Size
• AC or Battery Operation • Light Weight
• Safety - Underwriters' Laboratories Listed
ALTEC.
SOUND PRODUCTS DIVISION
Sp ecifications and componen ts subjec t to cha1'Lg<' w itho1lt
no tice. Overall perforrnan ce will be maintained or i1nvr..oved.
1515 S. Manchester Ave., Anaheim, Calif. 92803 Litho in USA
42-02-042140-05
CP-475-2.SK

DATA CONTENTS
Item Page Graphics Page
SPECI FlCATION S 3 Figure 1. Typical Power Output Versus
Frequency for 1%THO (4-Ohm
DESCRIPTION 4 Load) 3
ACCESSORIES 4 Figure 2. Typical % THO Versus Frequency
INSTALLATION 4 for 50-Watt Output 3
RACK INSTALLATIO N 4
SHELF INSTALL ATIO N 4
VENTILATION 4
Figure 3. Front View With Hinged Panel
Open 4
ELECTRICAL 5
120 Volt, 50/6 0 Hz Power Connections 5 Figure 4. Rear View of 1593B Power
240 Volt, 50/6 0 Hz Power Connections 5 Amplifier 5
Battery Connections 6
Input Connections 6 Figure 5. Converting to 240V ac, 50/60
Output Connections 7 Hz Operation 6
Speaker Matchi ng 7
Speaker Power Distribution 7 Figure 6. Socket Wiring for Transfor mer-
OPERATION 7 Isolated Input Using 15095A
Line Transformer 6
CONTROLS AND INDIC ATORS 7
HIGHPASS Fl LTER 7 Table I. Terminalsand Applications of
SERVICE 7 INPUT Terminal Board 6
ACCESS 7 Table 11. Speaker Outputs 7
ADJUSTMENT OF POWER DRIVER
BALANCE CONTROL 7 Figure 7. Typical Solid-State Component
ADJUSTMENT OF OUTPUT "Q"
BALANCE CONTROLS 8 Configurations 9
ASSEMBLY REPLACEMENTS 8
Fuses 8
Pilot Lamp 8
Figure 8. Component Locations Inside
Main Chassis 10
Power Driver PCB 8
RECOMMENDED SERV ICE TECHNIQUES 8 Figure 9. Component Locations on Rear
Transistor Orientation 8 of Chassis 10
Replacing Power Transistors 9
Testing Transistors 9
Replacing PCB Components 9 Figure 10. Schematic (2D356-7), 1593B
Power Amp lifier 11
Repairing Fractured or Damaged PCB
Conductor 9 Figure 11. Component Locations (2C364-4),
PARTS LIST 13 Power Driver PCB Assembly 12
MAIN CHASSIS 13
POWER DRIVER PCB ASSEMBLY 14
-2-

Type :
Gain:
Input
Sensitivity:
Power Output:
Frequency
Response :
Input
Impedance:
Load
Impedance:
Load Voltage:
Output
Impedance :
Noise Level:
70
v, 60
I-
I-
<(
S: 50
40 )
SPECIFICATIONS
Power Amplifier
61 dB
0.8V rms direct
0.8V rms with 15335A line
transformer
0.15V rms with 15095A line
transformer
50 watts at less than 1 percent THD
45 - 20,000 Hz (see Figure 1)
± 1 dB, 20 - 20,000 Hz
15,000 ohms direct
15,000 ohms balanced with 15335A
line transformer
600 ohms balanced with 15095A
line transformer
4, 8, 16, 100 ohms
14, 20, 28, 70 volts
Less than 10 percent of nominal
load impedance
-38 dBm; 85 dB below rated output
--
--
.,,
/ /
, I
Controls: Potentiometer, continuously variable
Power Supply: 120/240 volts 50/60 Hz
13 watts at zero signal
Operating
Temperature
Range :
Dimensions:
Weight:
Color:
Accessories:
85 watts at 17 watts output
145 watts at 50 watts output
- or -
24/28 volts de
0.2 amp at zero signal
2.5 amp at 17 watts output
4.0 amp at 50 watts output
battery minus (-) is ground
Up to 55°C ambient
5-1/4" H x 19" W x 7-3/8" D
23 pounds
ALTEC Green
15095A Plug-In Line Transformer
15335A Plug-In Bridging and Match-
ing Transformer
,-------NOTE--- - ---
Accessories must be ordered separately.
1%T HD --
I'--,
.......
~
RATED POWER '
2
20 3 4 567891 2 3 4 5 67891 2 3 4 5 67891 2
20000
0
I
I-
*
3
2
0 2
20 3
100 1000 foooo
FREQUENCY IN HERTZ
Figure 1. Typica l Power Output Versus Frequency for 1% THD (4-Ohm Load)
\ .....
4 567891 2 3 4 5 67891 2 3 4 5 67891
100 1000 10000
FREQUENCY IN HERTZ
Figure 2. Typical% THD Versus Frequency for 50-Watt Output
-3-
-----
2
20000

DESCRIPTION
The AL TEC 1593B Power Amplifier delivers up to 50
watts of output power for all types of sound reinfor cement
systems. It remains stable with operating conditions of
varying line voltages and with all types of loads, including
long, unloaded speaker lines having considerabl e capacitance.
Performance character istics are shown in Figur es 1 and 2.
A switchab le, two-section highpassfilter is provi ded to pro-
tect driver loudspeakersfro m excessivelow-frequ ency power
demands.
AL TEC's Active Dissipatio n Sensing Circuit prov ides fail-
safe protection for the out put transistors. Circui t action is
immediate and effec tive at all frequencies within the pass-
band of the amplifier, limiting only that portion of program
material that would damage or degrade the output
transistors .
ACCESSORIES
A plug-in 15095A or 15335A Line Transforme r is available
to provide line isolation. Input sensitivity for full-rated
amplifier output is 0.2V rms with the 15095A Transformer
and 0.8V rms with the 15335A Transformer.
The 42526 Shelf Mount Cover is available to enclose the
1593B for shelf use. It tilt s the 1593B for easy accessto
front panel controls. The sides and top extend beyond the
front panel to prevent accidental changes of control settings.
The cover provides easier handling for portability and it is
sturdy enough to support lightw eight equipment placed on
top of it. Four polyethylene feet prevent marring of sur-
faces. The AL TEC green finish matches the front panel of
the 1593B.
INSTALLATION
The 1593B may be installed in a standard 19-inch equip -
ment rack, or in the 42526 Shelf Moun t Cover accessory
for shelf use. Vertical space required is 5¼ inches (3 rack
units).
RACK INSTALLATION
Step 1.
Step 2.
Step 3.
Remove four screws securing fr ont panel. Open
and lower panel asshown in Figure 3.
lnstalI 1593B in equipment rack with appro-
priate four screws supplied .
Close front panel and secure with four screws
previously removed.
SHELF INSTALLATION
The 1593B may be shelf mounted asdesired after installing
the AL TEC 42526 Shelf Mount Cover (refer to 42526
Installation Instructions).
VENTILATIO N
The 1593B generates minimal heat during normal use. Al-
though the amount of heat is relatively low, the amplif ier
'Q ' BALANCE{ Rl40
CONTROLS Rl4l POWERDRIVER
PCBASSEMBLY POWERDRIVER PRIMARYPOWER
TERMINAL BOARD(TB3)
BALANCECONTROL(Rll6)
Figure 3. Front View With Hinged Panel Open
- 4-

must be ventilated to prevent an excessive temperature rise.
Because transistors are heat sensitive, the 1593B should not
be placed adjacent to heat-gene rat ing equipment or in areas
where ambient temperature exceeds 55°C (131 °F).
If the 1593B is installed in an equipment rack or cabinet
with other heat-producing equipment installed above and /or
below (two or more 1593B's or one 1593B with real time
analyzer, oscilloscope, etc.), space must be provided be-
tween the units or the 1593B may become too warm . The
1-¾" perforated panel (ALTEC Part No. 10399) is recom-
mended for this purpose. When several amplifiers or other
heat-producing units are installed in a single rack or cabinet,
acceptable air temperature may be in doubt. To determine
temperature conditions, operate the system until tempera-
ture stabilizes, then measure air temperature with a bulb-
type thermometer held at the bottom of the uppermost
amplifier. Do not let the thermometer bulb touch metal be-
cause the metal probably will be hotter than the ambient air.
If air temperature exceeds 55°c (or if it is a hot day), the
equipment should be spaced farther apart or a blower
should be installed to ventilate the cabinet.
r------- CAUTION------~
Do not block the cover ventilation holes
when placing other equipment on the
42526 Shelf Mount Cover accessory .
When shelf-mounting the 1593B, allow at
least 1-¾" between the unit and any wall
behind it to assure air circulation past
the output transistors.
ELECTRICAL
120 Volt, 50/60 Hz Power Connections
Equipment supplied for domestic use is provided with the
power transformer primary strapped for 120 volts (terminals
BATTERYPOWER
FUSE(F2)
BATTERYPOWER
TERMINALBOARD
VOLTAGE
RATING
PLATE
Figure 4. Rear View of 1593B Power Amplifier
1 to 2 and 3 to 4 on TB3) . The power input nameplate,
adjacent to the power cord on the chassis, is mounted to
show the appropriate side specifying the connections (see
Figure 4) . Verify that line voltage is in accordance with the
voltage rating before connecting the 1593B to line power.
240 Volt, 50/60 Hz Power Connections
Export equipment is provided with the power transformer
primary strapped for 240 volts (terminals 2 to 3 on TB3).
The power input nameplate, adjacent to the power cord on
the chassis, is mounted to show the appropriate side specify-
ing the connections .
For a 1593B previously wired for 120V ac primary power,
use the following procedure to change wiring for 240V ac,
50/60 Hz operation:
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Remove four screws securing front panel, open
and lower panel.
Locate terminal board TB3 (see Figure 3).
Remove strap "A" connecting terminals 1 and
2 and remove .strap "B" connecting terminals 3
and 4; solder strap "C" to terminals 2 and 3
(see Figure 5).
Remove voltage-rating plate (see Figure 4) from
chassis, reverse and reinstall to show 240V ac
rating.
Close front panel and secure with four screws
previously removed.
FILTER
SWITCH(SJ)
TRANSFORMER
ACCESSORY
RECEPTACLE
(ACCl)
OUTPUT
TERMINALBOARD(TB2) INPUT
TERMINALBOARD(TBl)
-5-

REMOVE STRAPS 'A' AN D 'B'
THEN INSTALL STRAP 'C'
FOR 240V OPERATION
S2
ON-OFF
240V AC
50/60 HZ
Figure 5. Converti ng to 240V ac, 50/60 Hz Operation
Battery Connections
If desired, the 1593B may be connected to an ext ernal
24/28 volt battery with minu s (-) asground . Termin als for
the de power connections are on TB4 (see Figures 4 and
10). If ac power fails, transfer to de power is instantaneous,
automatic and silent. A buil t-in charging circuit supplies a
100 mA trickle current to maintain batte ry charge during
ac operation. The battery power supply is not operated by
the primary power ON-OFF switch on the fr ont panel. If
switching of battery power is desired, an exte rnal relay or
switch should be prov ided by the user.
Input Connectio ns
Input connections may be either direct-coupled or
transformer -isolated at the INPUT termin al board (see
Figure 4). Direct couplin g is accompli shed by con-
necting the input leads (shielded conducto r recommended)
to terminals 1 and 2. Termin ,;1I 2 is ground . Tabl e I lists the
terminals and applications of the INPUT terminal board.
Table I. Terminals and Applications of
INPUT Terminal Board
Terminals Functi on/Application
1,2 (GND) Direct -Coupled For unbalanced high-imped-
ance sources
For bridging unbalanced
low -impedance li nes having
signal vol tages of 0.8V rms
or higher
3,4 Transformer- For balanced or unbalanced
Isolated lines of 150 or *600 ohms
up to level of +15 dBm
(with 15095A Lin e Trans-
fo rmer)
For low-impedance line-
bridging input or 15K ohm
line-matching input (with
15335A Line Transfor mer)
* Factory wiring at tr ansform er receptacle J1 is for
600 ohms
-6 -
For transforme r-isolated input, a plug-in 15095A or 15335A
Line Transfor mer must be plugged into receptacle J1 (see
Figure 4). The input leads are connected to terminals 3 and
4 of the INPUT terminal board .
When shipped from the factory, pins 3 and 4 of J1 are
strapped togeth er to prov ide a 600-ohm input . A 150-ohm
input may be obtained by removing the strap from pins 3
and 4 and then strapp ing pins 1 and 4 and pins 3 and 6
(seeFigure 6).
1500 WIRING
15095 A
LINE TRANSFORMER
6000 WIRING
Jl
15335 A
BRIDGING AND MATCHING TRANSFORMER
Figure6 . Socket Wiring for Transforme r-Isolated Input
Using 15095A Line Transform er

Output Connections
Output transformer taps provide connections for 4-ohm,
8-ohm and 16-ohm speakers, plus a 70 .7-volt speaker distri-
bution system (see Figure 4). For 25-volt speaker distribu-
tion systems, use the 16-ohm tap. Connect to the terminal
of desired impedance and terminal 5 (common). Terminal
functions and designations are listed in Table 11. If stray
electrostatic radiation causes interference, strap terminal 5
(common) to terminal 6 (ground).
------ CAUTION-------,
When using stranded wire, be sure no
frayed wire strands short circuit one
terminal to another terminal.
Table 11. Speaker Outputs
Terminal Function
70V 70. 7V (100 ohms) speaker distribution systems
16r2 16 ohms (28V) speaker systems. May be used
for 25V speaker distribution systems.
8r2 8 ohms (20V) speaker systems
4r2 4 ohms (14V) speaker systems
COM Common
GND Ground
Speaker Matching
Use the output tap most nearly equal to total speaker
impedance . If the load impedance falls between two out-
put terminal values, use the terminal of lower impedance .
Speaker Power Distribution
Total power distributed to all speakers should be not greater
than the power rating of the amplifier system . The 70.7V
distribution outlet permits connection to a large number of
speakers, each speaker operating at its required power level.
Computing impedance is not necessary for this application.
Each speaker is equipped with a line transformer having
various power taps . Select the tap which yields the power
desired for that speaker.
OPERATION
CONTROLS AND INDICATORS
Two operating controls are on the front panel; a VOLUME
control and a primary power ON-OFF switch. A pilot indi-
cator is lit when the power is ON.
HIGH PASS Fl LTER
A two-section highpass filter is provided with the 15938 to
protect driver loudspeakers from excessive low-frequency
-7-
power demands. Filter use is indicated when high power
output from the amplifier is applied to driver loudspeakers
not equipped with protective crossover networks. The
3 dB frequency of the highpass filter is approximately
400 Hz.
A Fl LTE R IN-OUT switch is located on the rear of the
chassis (see Figure 4). The switch is placed in the OUT
pos ition when the 15938 is shipped from the factory.
SERVICE
If a malfunction occurs, service should be performed by an
ALTEC Qualified Service Representative. For factory ser-
vice, ship the 15938 prepaid to Customer Service, ALTEC,
1515 South Manchester Avenue, Anaheim, California 92803.
For additional information or technical assistance, call
[phone], or TWX 910-591-1142 .
Main chassis component locations are shown in Figures 8
and 9. The 15938 schematic is shown in Figure 10. Com-
ponent locations on the Power Driver PCB are shown in
Figure 11.
ACCESS
Remove the four screws securing the front panel, then
open and lower the hinged front panel to gain access to the
chassis interior .
If the ALTEC 42526 Shelf Mount Cover accessory is in-
stalled, remove by reversing the steps of the cover installa-
tion procedure given in the associated instructions .
ADJUSTMENT OF POWER DRIVER BALANCE
CONTROL
The Power Driver Balance Control (R 116 on Power Driver
PCB), balances the outputs of transistors 0104 and 0105
on the PCB. If this control is not adjusted properly, high-
frequency distortion results. If adjustment is indicated, use
the following procedure:
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Connect a 16-ohm dummy load across 16r2and
COM (common) terminals of TB2 (see Figure
10).
Apply a 20 kHz sine wave to terminals 1 and 2
of the INPUT terminal board (TB1) .
Adjust VOLUME control for 50-watt output
(28 volts).
Connect a frequency distortion analyzer (pre-
ferred) or an oscilloscope to 16r2 termina ls
(16-ohm speaker output) of OUTPUT terminal
board and observe output.
Remove four screws securing front panel, then
open and lower panel.

Step 6.
Step 7.
Adjust R116 on Power Driver PCB (see Figures
3 and 10) until minimum distortion is obser ved
on distort ion me asu ring instrumen t .
Close fro nt panel and secure with four screw s
previously removed .
ADJUSTMENT OF OUTPU T "Q" BALANCE CONTROLS
Outp ut "Q" Balance Cont rols R 140 and R141 on Power
Driver PCB (see Figur e 3) balance the bias current of power
transistors 01, 02 , 0 3 and 0 4. Inadequate adjustment of
these controls may resu lt in distortion and exces sive cu rrent
drain from one or mo re power transistors. If adjustment is
indica ted (such as replaceme nt of one or mor e power tra n-
sistors), use the follow ing recom mended procedu re:
Step 1.
Step 2.
Turn VOLUME control fully count erclockw ise
(0).
Remove four screws securing front panel, then
lower pane l for access to interior.
.------- CAUTION----- --
High voltage may be encountered when
Step 3.
Step 4.
Step 5.
Step 6.
the chass is is open ed for service. This
procedure should be referred to a quali-
fied serv ice technicia n.
Turn Output "Q" Balance Control s R140 and
R141 fully clockwise (see Figure 3) .
Turn on powe r and allow a 5-minu te war mup
period.
Adjust R140 and R 141 by one of the follow ing
method s [method (a) is preferred] :
(a) Locate wire attached to termi nal 1 of
outp ut tran sformer T2. Conn ect a clam p-
on milliam mete r to this wire and adjust
R14 0 coun terclockwi se for a "Q" cur-
rent of 30 mA. Change connection of
milliammet er to wire attached to termina l
3 of outpu t tran sformer T2 and adjust
R141 fo r a "Q" current of 30 mA.
(b) Rem ove two screws securing Power Driver
PCB to cha ssis and lower PCB on hin ged
conn ector. Connect a millivol tm eter
acros s resisto r R4 (see Figur e 8), starti ng
with highest scale to protec t meter . Ad-
just R140 for meter reading of 10 mV.
Chan ge con nection of millivoltm eter to
read across resistor R5 and adjust R141
for meter readi ng of 10 mV. Rem ove
millivo ltmet er and secure PCB to chassis
with two screws previously remov ed .
Close front panel and secure with four screws
removed in Step 2.
-8-
ASSEMBLY REPLACEMENTS
Fuses
The ac primary power fuse is mounted o the front panel
(see cover photo). The battery power fuse is located on the
rear of the chassis (see Figure 4). If fuse replacement is re-
qui red, determine and correct any cause of fa ilure before re-
placing fuse. Install an ident ical fuse (see PARTS LIST) by
unscrewing fuse holder, replacing fuse and resecuring fuse
holder .
Pilot Lamp
The pilot lamp is located on the front panel (see cover
photo). If replacement is required, unsc rew the red pilot
lamp shield to expose the bulb. Press bulb inward and turn
counterclockwis e (ccw) to remove . Install an identical bulb
(see PARTS LIST), then replace red pilot-la mp shield .
Power DriverPCB
If the amplifier fails because of a faulty power driver PCB,
operation may be restored by rep lacing the PCB with a new
or repaired PCB. Use the following procedu re.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Remove four screws securing front panel. Open
and lower pane l for access to PCB (see Figure 3).
Remove two screws securing PCB to chassis
brac kets .
Carefully remove PCB from con nector.
Carefully insert new or repair ed power driver
PCB into conne ctor . Do not war p, bend or twist
the board or conductor may fra cture .
Secure PCB with two screws removed in Step 2.
Perform ADJUSTMENT OF POWER DRIVER
BALANCE CONTROL procedu re.
RECOMMENDED SERVICE TECHNIQUE
If systematic troubleshooting shows need fo r parts replace-
ment, observe the following precautions .
Transistor Orientation
Solid-state com ponents are packaged in various case sizes
and types with various lead orientations (see Figure 7 ). Be-
fore removing a solid-state component fro m tie points or
from a PCB, sketch the lead orientation with respect to the
tie points or PCB.
Form the leads of the new component to co nform with the
leads of the par t being replaced to aid in making proper
connections. Before removing small transis tors, note posi -
tion of index tab with respect to the PCB or socket. Cut
the leads of the new transistor to the requ ired length and
insert them, properly indexed , into the PCB or socket.

ReplacingPower Transistors
Verify the following conditions exist when replacing
power transistors .
1.
2.
3.
4.
Mica insulator is not damaged. If damaged, use new
insulator.
No grit or metal particles are between transistor and
heat sink.
Both sides of mica insulator are covered with silicone
grease or fluid.
Mounting screws are tight.
·TestingTransistors
Transistors should be checked with a transistor tester. If a
tester is not available, use the following procedure for test-
ing transistors with an ohmmeter.
Step 1. Remove suspected transistor from circuit (see
Replacing PCB Components).
~------NOTE-----------.
Step 2.
Step 3.
Step 4.
Transistors may be tested while still in the
circuit; however, the nominally accepted
10 :: 1 resistance ratio for 'front-to-back'
measurements may be lower.
Connect ohmmeter leads to base and emitter.
Read on lowest ohms scale. Reverse leads and
read again. Normal readings should be at least
10 times greater in one direction than in the
other.
Connect ohmmeter leads to base and collector.
Ohmmeter readings should be similar to those
obtained in Step 2.
If Steps 2 and 3 show normal function, connect
ohmmeter leads to collector and emitter. Read
on lowest ohms scale. Reverse leads and read
again. If reading is low and virtually unchanged
PIN 1 - BASE
PIN 2 - EMITTER
when ohmmeter leads are reversed, the transistor
has a short circuit between collector and emitter.
ReplacingPCBComponents
Before removing PCBcomponents for testing or replacement,
read and perform the following instructions.
1.
2.
3.
4.
Solid-state components and PCB's may be damaged by
excessive heat. Use a small soldering iron with a
1/8-inch diameter chisel tip and use small-diameter
60/40 rosin-cored solder.
Remove components by placing soldering iron on
component lead on conductor side of PCB and pull
out lead. Avoid overheating the conductor.
~-----CAUTION----------.
The conductor on the PCB is a metal
surface plated with solder and laminated
to the board. Too much pressure or over-
heating may lift the conductor from the
board.
If component is faulty or damaged, clip leads close to
component and then unsolder leads from board . With-
draw leads from component side.
Clear solder from circuit board holes before inserting
leads of new component. Heat solder remaining in
hole, remove iron and quickly insert a pointed non-
metallic object, such as a toothpick, from conductor
side.
5. Shape new component leads and clip to proper
length. Lead shape should provide stress relief for
component. Insert leads in holes, observing same
polarity or orientation of removed component. Apply
heat and solder on conductor side.
RepairingFracturedor Damaged PCBConductor
If a conductor is fractured, damaged or lifted from the cir-
cuit board, a recommended method of repair is to solder a
section of good conducting wire along the damaged area
and then seal with epoxy.
LEAD 1 - EMITTER
LEAD 2 - BASE
T0-3©2
& 0 01 0
TO-66 MTG FLANGE - COLLECTOR LEAD 3 - COLLECTOR
LEAD 4 - CONNECTED TO CASE
TO-5
INDEX TAB
LEAD 1 - EMITTER
LEAD 2 - BASE
LEAD 3 - COLLECTOR & CASE*
*NOT ALL TYPES. SOME HAVE BASE-
TO-CASE INTERNALLY; OTHERS
HAVE NO CONNECTION TO CASE.
LEAD E - EMITTER
LEAD C - COLLECTOR
LEAD B - BASE
TO-92 ~ • • LEAD E - EMITTER
E C B LEAD B - BASE
LEAD C - COLLECTOR
Figure 7. Typical Solid-State Component Configurations
-9-

TB4
POWERDRIVER
PCBASSEMBLY
REMOVED
(SEEFIGURES3, 12)
Jl ACCl Cl Sl C2 Q4 R7 C3 T2 R6 Q3 Q 1 TB3 C4 CR4 RS C5 F2 TB4
TBl Q2 R3 CR3 R5 Rl TB2 R2 CR2 R4 Fl Rl 1 PL1 S2 Tl TBS
Figure 8. Component Locations Inside Main Chassis
F2 C4 Q3 T2 Q4 Sl ACCl
Tl C5 Ql TB2 Q2 TBl
Figure 9. Compone nt Locations on Rear of Chassis
- 10-

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J.VOLTAGE SHOWN UNDERSCORED ARE DC VOLT AGES
MEASU RED TO CHA SSI S (G NO) WI TI-1 ZERO SI GNAL
AND 120VOLTS AC LINE .
2.CA PACIT"NCE IN MFO EXCEPT AS NOTED
I. RESIST ANCE IN OHMS
NOTES
r1
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en 20v
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SCHEMATIC
15938
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Figure 10. Schematic (20356-7), 1593B Power Amplifier
120 V
50-60.,..
AlTEC
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A::::...~ ':...":..'-
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Figure 11. Component Locations (2C364-4), Power Driver PCBAssembly
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7
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Reference Ordering
Designator Number
A1 27-01-042041-01
C1 15-02-100087-01
C2 15-02-100307-01
C3 15-06-100139-01
C4 15-01-100284-01
C5 15-01-119405-01
CR1 48-01-100881-01
CR2,3 48-01-102592-01
CR4 48-01-107271-01
CR5 48-01-108576-01
CR6,7,8 48-02-107467-01
Fl 51-04-110782-01
F2 51-04-100470-01
PL1 39-03-100793-01
01,2,3,4 48-03-040934-02
PARTS LIST
MAIN CHASSIS
Name and Reference
Description Designator
Amplifier PCB R1
Assembly
Cap;, 0.02 µF .R2,3
±20%, 100V
Cap., 0,01 µF R4, 5
±20%, 100V
Cap., 0.33 µF R6
±10%, 100V
Cap., 1000 µF,
35V R7
Cap., 7000 µF,
40V RS
Diode, stabistor,
STB567 R9
Diode, 1N4004
(selected) R10
Diode, LMZ 20A
Diode, LMZ 15A R11
Diode, rectifier,
1N542
Fuse,2A, 3AG S1
Fuse,5A, 3AG S2
Pilot light assembly Tl
Transistor, 2N6254
(selected) T2
-13-
Ordering Nameand
Number Description
47-06-042509-1 Potentiometer, 15K.Q
47-02-108440-01 Res.,0.5.Q
±10"/4,5W
47-02-108691-01 Res.,0.3.Q .
± 10"/4,5W
' '~7-02-109388-01 · Res.,3.Q
± 10%,5W
47-01-100652-01 Res., 1.8K.Q
±10%, 1W
47-01-102551-01 Res.,470.Q
±5%,3W
47-02-100715-01 Res.,200.Q
±10%,5W
47-01-100638-01 Res.,47.Q
±10%, 1W
47-01-102376-01 Res.,56K.Q
±10%, 1/2W
51-02-100992-01 Switch, slide
51-02-100988-01 Switch, power
56-08-007218-05 Transformer, power
56-07-016739-03 Transformer, output

r
PARTS
POWER DRI
I
Reference Ordering Name and
Designator !Number Description
C101 15-01-100156-01 Cap., 1µF, 25V
I
C102 15-02-107470-01 Cap., 220 pF
15-ot 100306-01
±10%, 100V
C103 Cap., 0.0015 µF
I ±20%, 100V
C104,105 15-01-108543-01 Cap., 5 µF, 25V
C106,107 15-06-102605-01 Cap., 0.47 µF,
100V
C108,109 15-02-100047-01 Cap., 0.002 µF
±10%, 500V
C110,111 15-02-100307-01 Cap., 0.01 µF
±20%, 100V
C112,113 15-02-108643-01 Cap., 0.0082 µF
±20%, 100V
C114,115 15-02-100302-01 Cap., 470 pF
±10%, 100V
CR101, 48-01-107017-01 Diode, 1N456A
102,103,
104
0101, 103, 48-03-101098-01 Transistor,
108,109 2N2712
(selected)
0102 48-03-041440-01 Transistor,
2N3906
(selected)
0104,105 48-03-041627-01 Transistor,
2N5308
(selected)
0106,107 48-03-040461-02 Transistor,
2N3053
(selected)
R101 47-01-100479-01 Res., 680KS°2
±10%, 1/4W
R102 47-01-102190-01 Res., 180KS°2
± 10%, 1/4W
H103, 106; 47-01-102171-01 Res.,4.7KS°2
110 ± 10%, 1/4W
LIST (Continued)
VER PCB ASSEMBLY
Reference
Designator
R104,105,114
R107
R108,109
R111,112
R113
R115,117
R116
R118,119
R120,123
R121,122
R124
R125
R126,127
R128
R129,132
R130,133
R131,134
R135,136
T101
-14-
LISTED
209J
OrdJring
Number
47-01-102167-01
47-01-100477-01
47-01-102102-01
47-01-102187-01
47-01-102177-01
47-01-10214 4-01
47-05-014697-01
47-01-102162 -01
47-01-109390-01
47-01-102238-01
47-01-102040-01
47-01-102058-01
47-01-102345-01
47-01-102148-01
47-01-102163-01
47-01-102179-01
47-01-102175-01
47-01-102161-01
56-07-015315 -07
Name and
Description
Res., 2.2K s-2
±10%, 1/4W
Res., 470KS°2
±10%, 1/4W
Res., 10KS°2
±5%, 1/4W
Res., 100KS°2
±10%, 1/4W
Res., 15KS°2
± 10%, 1/4W
Res., 27S°2
± 10%, 1/4W
Potentiometer ,
50S°2
Res.,820S°2
± 10%, 1/4W
Res., 560S°2
±5%, 1W
Res., 82S°2
±5 %, 1/2W
Res., 27s-2
±5%, 1/4W
Res., 150S°2
±5%, 1/4W
Res., 180f2
± 10%, 1/2W
Res., 56s-2
± 10%, 1/4W
Res., 1Ks-2
.±_10%, 1/4W
Res., 22Kr2
±10%, 1/4W
Res., 10KS°2
± 10%, 1/4W
Res., 680S°2
± 10%, 1/4W
Transformer, driver