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SYSTEM
SPECIFICATIONS
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The
following are typical and apply for 70dB gain, rms, 20Hz – 20kHz, RS
= 150 ohms, RL = 100k ohms, TA = 25°C, AUX out option, and all outputs driven, unless
otherwise noted.
|
|
| Preamplifier |
|
|
Outboard
Gain Control |
|
| Channels |
balanced,
symmetrical |
Channels,
GC62 |
2 |
|
Model 61 |
1 |
GC64 |
4 |
|
Model 62, 62R |
2 |
Control range |
12.5
– 70dB |
| Input |
differential |
Positions |
24 |
|
Impedance, balanced |
2M ohms
nom || 100pF |
Control
signal* |
4Vdc,
78uA |
|
Unbalanced |
1M
ohms nom || 180pF |
Peak indicator
level |
+24dBu |
|
Phantom |
13.6k
ohms |
Hold time |
100ms |
| Maximum
level |
See
DR graph |
Dimensions |
1U,
19in rackmount |
| Equivalent
input noise |
See
DR graph |
|
3in
(75mm) D FMS |
| Common-mode
rejection ratio |
>
110dB |
Weight, GC62 |
2.0lb (0.9kg) |
| Frequency
response |
±0.04dB |
GC64
|
2.3lb (1.0kg)
|
| Bandwidth |
3Hz
– 200kHz |
|
| Gain
range |
7.5
–
70dB |
Dynamic
Range |
|
Step |
2.5dB |
 |
|
Accuracy |
±0.1dB |
|
Tracking |
0.1dB |
|
Control range (Model 61, 62) |
12.5
– 70dB |
|
Positions |
24 |
| AUX
input |
non-differential |
|
Impedance, balanced |
2M
ohms nom || 80pF |
|
Unbalanced |
1M
ohms nom || 160pF |
|
Maximum level |
+30dBu |
|
Equivalent input noise |
–111dBu |
|
Frequency response |
±0.00dB |
|
Bandwidth |
1Hz
– > 300kHz |
|
Gain |
0dB |
| Crosstalk
(<>all chs, 15dB gain) |
<
–110dB |
| Output
(A, B, AUX) |
|
|
Impedance, common-mode |
6
ohms |
|
Maximum level (RL = 600 ohms) |
+30dBm |
The
maximum input level is limited only by the maximum output level of
+30dBm at or less than 0.1%THD, as the output stage clips before the
input stage at all gain settings. |
|
Offset |
±0.5mVdc |
| Peak
indicator level (Model 61, 62) |
+24dBu |
|
Hold time |
100ms |
|
| Phantom
supply |
+48Vdc,
14mA/ch |
Signal
Path with AUX Input and Output Options |
| Power
supply |
|
 |
|
Voltage options (50 – 60Hz) |
100,
120, 240Vac |
|
Operating range |
±15% |
|
Power consumption, Model 61 |
19VA |
|
Model 62, 62R |
29VA |
|
Leakage current (120Vac, 60Hz) |
20uA |
| Dimensions |
1U,
19in rackmount |
|
Model 61 |
10in
(254mm) D FMS |
|
Model 62, 62R |
14in
(356mm) D FMS |
|
| Weight,
Model
61 |
7.7lb (3.5kg) |
*The
control link from preamp to gain control is a dc control signal (no
audio) via mic cable, 2 channels per cable, XLR male to female, with all
3 pins straight-wired. The signal is mic snake compatible and noise
tolerant. |
|
Model 62 |
11.3lb (5.1kg) |
|
Model 62R |
11.0lb (5.0kg) |
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