1000 Hz test tone.
5. Play the other tones on the test record and write
down the column indications for each frequency
played on the test record.
6. Transfer the readings obtained in Step 5 to the
graph in Figure 33. Compare your curve with the
curve on the graph. A deviation of 3 dB is acceptable.
FIG. 31 POWER TABLE
PHONO CHANNEL SEPARATION CHECK
Check channel separation of your system with the aid
of a test record (such as the CBS STR 100).
Make this test and all single frequency tests at low
acoustic levels to prevent potential loudspeaker damage.
To observe the results follow the instructions furnished
with the test record and:
1. Depress the LEVEL button.
2. Play the left channel spot frequency band on the
record.
3. Set the POWER LEVEL selector to a position that
yields approximately 0 dB deflection on the left
column.
4. You should obtain a display like that shown in Figure
32. The difference in height between left column and
right column indicates left to right channel separation
in dB. The POWER LEVEL switch may be advanced to
increase the level of the right volume if necessary.
Each step of the POWER LEVEL switch adds 5 dB.
(20 dB is generally considered fair, 30 dB good and
40 dB excellent.
Repeat steps 2, 3 and 4 but play the right channel for
right to left channel separation measurements.
FIG. 32 CHANNEL S E P A R A T I O N (Approx 15dB)
AMPLIFIER LINEARITY CHECK
With the aid of a test record you may perform an ampli-
fier linearity check.
Make this test and all single frequency tests at low
acoustic levels to prevent potential loudspeaker damage.
High intensity single frequency program material can
overheat the loudspeakers voice coil and cause burn out.
To perform this check:
1. Depress the L button.
2. Play the 1000 Hz test tone on the record.
3. Set the POWER LEVEL selector switch to a setting that
produces an adequate display between 1000 and 0.1
watt.
4. Depress the 200-2,000 SWEEP FREQUENCY button
and adjust the SWEEP control to obtain a few cycle
waveform.
5. Referring to Figure 34: waveform A is sinusoidal and
16
LEVEL
SCALE
POWER LEVEL SWITCH SETTING (WATTS)
(dB)
+3
+2
+1
0
-1
-3
-5
-7
-10
-20
1000
1000
800
630
500
312
250
126
100
50
5
300
300
240
190
150
93
75
38
30
15
1.5
100
100
80
63
50
31.2
25
12.6
10
5
0.5
30
30
24
19
15
9.3
7.5
3.8
3.0
1.5
.15
10
10
8
6.3
5
3.12
2.5
1.26
1.0
.5
.05
3
3
2.4
1.9
1.5
.93
.75
.38
.3
.15
.015
1
1.0
.8
.63
.5
.312
.25
.126
.1
.05
.005
3
.3
.24
.19
.15
.093
.075
.038
.030
.015
.0015
.1
.1
.08
.063
.05
0312
.025
0126
.01
.005
.0005