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DESCRIPTION
The AL TEC 1593B
Power
Amplifier
deliv
ers
up to
50
watts
of output power
for
all
types of sound reinfor cement
systems.
It
remain
s
stabl
e
with
operating conditions
of
varying line voltages
and w
it
h
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
highpass
filter is
provi ded to pro-
tect
driver
loudspeak
ers
fro
m
excessive low-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
t
ive
at
all
frequencies
within
t
he pass-
band of the amplifier, limiting only
that
portion
of
program
material
that
would
damage or
degrade
th
e
output
transistors
.
ACCESSORIES
A plug-in 15095A or 15335A Line Transforme
r is
available
to provide
line
isolat
ion.
I
nput
sensitivity for full-rated
amplifier output is 0.2V
rms
w
ith
the 15095A Tr ansformer
and 0.8V
rms
with the 1533
5A
Transformer.
The
4
2526 Shelf Mount
Cover
is
available
to enclose the
1593B for shelf use. It tilt
s
the 1593B for
easy access
to
front panel controls.
T
he
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
lig
htw
eight
equ
ipment 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 stand ard
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
as shown
in Figur
e
3.
lnst
al
I
1593B in
equipment
rack
w
ith
appro-
priate four
screws supplied
.
Close front
panel and
secure
w
ith
four
screws
previously
removed.
SHELF INSTALLATION
The 1593B may be
shelf
mounted
as desired
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
POWER DRIVE
R
PCB ASSEMBLY
POWER
DR IVER
PRIMARY POWER
TERMINAL BOARD(TB3)
BALANCE CONTROL(Rll6)
Figure
3
.
Front
View With Hinged Panel Open
-
4-
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