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 (AL TEC Part No. 10399) is recom-
mended for this purpose. When several amplifiers or other
heat-producing units are installed in a sing le 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, al low 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
BATTERY POWER
FUSE (F2)
BATTERY POWER
TERMINAL BOARD
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
TERMINAL BOARD (TB2)
INPUT
TERMINAL BOARD (TBl)
-5-
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