rauland SAX100 Quick guide

INSTALLATION AND SERVICE INSTRUCTIONS
SAX100 SOLID STATE POWER AMPLIFIER
DESCRIPTION:
The SAX100 is a 100 watt solid state power amplifier with
½ Amp. switched and 0.1 Amp. direct auxiliary D.C.
power supplies included. The unit is provided with a power relay which controls the amplifier, the
½ Amp. D.C. out-
put, and the A.C. receptacles from a remote Off-On switch.
To secure the best performance it is suggested that the following instructions be read very carefully. Upon re-
ceipt of the amplifier the packing list should be checked to determine if all items have been received in good con-
dition. Any physical damage found should be reported at once to the transportation company as all claims for damage
must be made by the consignee. The amplifier should be tested immediately upon receipt as any damage due to rough
handling by the transportation company should also be reported and claim filed for concealed damages.
SPECIFICATIONS:
Rated Output: 100 watts RMS
Peak Output: 200 watts
Gain: 77db
Frequency Response:
± 2 db 25 - 20,000 Hz
Distortion:
Less than 3% at rated output 50 - 5,000 Hz
Noise Level: 80 db below rated output
Regulation: Less than 2 db
Operating Temperature Range:
O°F to 130°F
Input Impedance: 50,000 ohms
Input Voltage Required: 0.3 volt for rated power output
Output Impedance: 6.25 ohms, 25 volts isolated or 50
ohms, 70.7 volts isolated. 105/130
VAC, 60 Hz
Power Requirements:
No Signal: 25 watts
l/3 Rated Power Output: 165 watts
Rated Power Output
& ½ Amp. D.C.: 275 watts
External Power Available: 28VDC
½ Amp.switched, and
Circuit Protection:
0.1 Amp. not switched, nega-
t ive ground.
3 Amp. slow blow line fuse. Auto-
matic reset thermal overload relay
on 120 volt, 60 Hz line. Automatic
reset thermal overload relay on ex-
ternal
½ Amp. DC line.
Tubes: None. 17 Transistors, 3 Diodes
Dimensions: 19” panel, 7” high, 7” deep
Controls: Input level adjustment
A.C. Control Circuit:
Current Rating:6 Amps. 120 VAC 720 watts
No. of Outlets:3, relay controlled
Associated Items:
MAX 2400A
MCX 1400A
PAX 2400A
PAX 2100A
PBX 1400A
Note: All tests conducted in accordance with EIA Standard SE-101-A where applicable.

INSTALLATION
The SAX100 amplifier may be operated in ambient
temperatures as high as
130°F. Forced air ventilation
may be required if the amplifier is installed in a con-
fined space or a rack with other heat producing com-
ponents.
INPUT CONNECTIONS
The SAX100 has a single ended, one side grounded
input. The amplifier may be driven from any source ca-
pable of delivering 0.30 volt or more to a 50,000 ohm
load. The input connection is available at either of the
pin jack connections on the rear panel of the amplifier.
AUDIO OUTPUT CONNECTIONS
The output of the SAX100 can be connected for either
25 volt or 70 volt output. Either side of the output may
be grounded; or if no ground connection is made, the out-
put voltage will be balanced. If it is necessary that a
center point between the two lines be grounded, a
2,200
ohm ±5% 1 watt composition resistor may be connected
from each side of the output to ground.
The output connections are available on the nine pin
plug on the rear of the unit. The mating plug should be
wired as shown below in Fig. No. 1 for either 25 volt or
70 volt output. Assembly of the plug and pins is shown
in Fig. No. 2.
USE MALE PINS IN OUTPUT PLUG
JUMPER 2.5 AND 8TOGETHER
JUMPER 3.6 AND 9T0GETHER
TAKE
OUTPUT FROM 8 AND 9
CABLE CONNECTOR
RAULAND PART NO. SM-0263
70 VOLT OUTPUT
40OHMS
JUMPER, AND 5 TOGETHER
JUMPER 6 AND 8 TOGETHER
TAKE 0UTPUT FROM 2 AND 9
FIG. NO. 1.
POWER LINE CONNECTIONS
The amplifier is provided with two A.C. line power
transformer taps. If the amplifier is to be used on a
line
voltage of less than 120 volts, the 120V tap should be
used. If the line voltage is greater than
12OV, the 13OV
tap should be used. These connections are accessible in
the upper left hand corner of the front chassis of the
amplifier. The amplifier is shipped from the factory wired
for 130 volt operation. The red-black wire is used for
the 130 volt connection, the yellow-black for the 120 volt
connection. To change the line voltage tap, disconnect
the wire going to the red-black lead and connect it to the
yellow-black, or vice versa. CAUTION: BE SURE AC
LINE CORD IS UNPLUGGED BEFORE MAKING THIS
MODIFICATION.
STRIP WIRE
3/16 INCH
CRIMP AROUND /
WIRE AND SOLDER
INSERT PIN FROM REAR OF RECEPTACLE UNTIL PIN IS
LOCKED INTO PLACE.
FIG. No. 2

SYSTEM GROUNDING OPERATION:
In any sound system it is necessary for the audio
common to be connected to the equipment chassis some-
where in the system. On the SAX100 the NEGATIVE
side of the power supply is also the audio common.
Further, it is recommended that for best results ONLY
ONE such connection be made in the entire system. It is
not always possible to predict the best location for this
connection, however, through experience Rauland has
found that generally the best place for this connection is
on the PRE-AMPLIFIER chassis. All Rauland pre-
amplifiers are supplied with this chassis connection. If
the amplifier is to be used without a Rauland
pre-ampli-
fier, some other chassis to negative connection MUST
BE PROVIDED. As shipped, THE SAX100 HAS NO
CONNECTION FROM CHASSIS TO POWER SUPPLY
NEGATIVE.
AUXILIARY D.C. POWER OUTLET
The SAX100 is able to furnish D.C. power for the
operation of relays and
pre-ampl if iers.
The power available is shown below and in Fig. No.
3. Pin assembly is shown in Fig. No. 2.
VOLTAGES
AVAILABLE
28 Volts Pos
(not-switched)
Negative Common
PIN
CONNECTIONS
No. 7
No. 3
No. 1
MAXIMUM
CURRENT
0.5 Amp.
loo MA.
MALE CABLE CONNECTOR
RAULAND PART NO. SN-0263-A
KE
POSITIVE
28V 0.1 AMP.
UNSWITCHED
Y (FEMALE)
0
I
POSITIVE 28V
½ AMP. SWITCHED
FIG. NO. 3
NOTE: Pins No. 1, 3, 4, and 7 are male pins. Pin
No.5,
the key pin, is female and must be in place to prevent
accidental connection to the AUDIO OUTPUT SOCKET.
When plugged into the power line, only the power
transformer of the SAX100 remains energized. This pro-
vides a voltage for the control relay. The control relay
is actuated by completing the circuit between wires from
pins
#1 (Negative Common) and #4 of the D.C. output and
control plug. This turns on the amplifier, D.C. supply,
and A.C. receptacles. Once on, the output level of the
amplifier may be adjusted with the input level control.
Protective Devices:
Line Fuse: The amplifier has a 3 ampere line fuse.
This is located inside the front chassis of the ampli-
fier in the upper left hand corner. Replace only with
a 3 amp 3 AG SLO-BLO fuse.
Thermal Overload Relay: If the temperature of the
amplifier rises to an unsafe level, the thermal over-
load relay located on one of the output stage heat
sinks will turn off the primary power. When the ampli-
fier cools to a safe operating level once more, the
thermal overload relay will automatically reset.
A second thermal overload relay protects the
½
Amp. D.C. output circuit. If an overload should occur
the thermal overload relay will open the circuit for
several seconds and then automatically reset. This
cycle will continue until the overload is removed.
HEAT SINK
WITH SOCKET
ATTACHED
/
MICA WASHER
/
&
f
/
COAT MICA WASHER ON BOTH SIDES
WITH DOW CORNING DC-4 SILICON
GREASEOREQUIVALENT.
TO-3CASE
TRANSISTOR
MOUNTINGSCREWS
#6x¼"SHEET METAL SCREWS
FIG. NO. 4
(Continued)

SERVICE NOTES
1)
REPLACEMENT OF POWER TRANSISTORS:
If it is necessary to replace power transistors, the
following diagram (Fig. No. 4) must be followed to
mount new transistors. Also, there is a colored num-
ber indicating the transistor gain group on the case
of the transistor. The replacement transistor(s) must
have the same number and color as the one removed.
After a new transistor has been mounted with the
mica insulating washer, check to see if its case is in-
sulated from the heat sink. To do this, check between
the transistor case and the heat sink, with an ohmmeter.
If there is a resistance indicated, the case of the tran-
sistor is shorted to the heat sink. ANY CHASSIS TO
COMMON CONNECTION MUST BE DISCONNECTED
WHEN MAKING THIS MEASUREMENT.
OUTPUT ADJUSTMENTS
The output stages of the
coupled from capacitors Cl4 SAX100 amplifier are direct
and Cl5 through transistors
Q10, Q11, Q12, Q13, Q14, Q15, Q16 and Q17 to the out-
put transformer primary. Replacement of transistors in
this circuit will require a check of the output balance to
insure best performance.
Required Equipment:
1) 50 mi II ivolt D.C. meter.
2) A.C. voltmeter capable
less. of indicating .003 volt or
Potentiometer RP-2 and RP-3 control the zero signal
bias for Q10, Q13, Q16
& Q17 and Q11, Q12, Q14, &
Q15 respectively.
1)
2)
3)
4)
5)
Connect the O-50 mi
llivolt meter across one of tha
0.25 ohm 5 watt output emitter resistors. (R64,
R66 or R63, R65).
Adjust RP-2 or RP-3, whichever is associated
with the side of the amplifier being adjusted,
set-
the voltage to 10 millivolts. (le = :+5 = 40ma).
Adjust the opposite side bias pot for minimum hum
and noise at the output as shown by the A.C. volt-
meter.
Check emitter resistor voltages. All should be
within the range of 5
- 20 millivolts. Adjust up
or down as required until all emitter voltages are
within limits. There is no interaction between the
adjusting potentiometers RP-2 and RP-3.
Potentiometer RP-1 is factory set for lowest dis-
tortion at rated power output at
1KC, and normally
should not require adjustment.
CAUTION: To obtain accuracy and to prevent meter
damage be absolutely certain that there is no signal
while making output adjustments. Turn volume control
down and do not introduce transients or hum by
ac-
cidentally touching low-level components. W
RAULAND-BORG CORPORATION
3535 West Addison Street Chicago, Illinois 60618
_
KI-0961-A
8/71