The supply, filter & gain unit PRE-33A has been designed to match Aco Pacific’s microphone capsule 7012 (and relative preamplifier 4012) and is needed to operate it. The PRE-33A powers the microphone connected to its input with a 200V phantom supply and adds a selectable weighting filter (A or B or C); also available there is a configurable attenuation/gain stage (-20dB/0dB/+20dB). The unit is operated with two standard 9V batteries or with an external DC power supply.
TECHNICAL SPECIFICATIONS
| FREQUENCY RESPONSE |
7Hz÷110kHz (-3dB)
|
| WEIGHTING FILTERS |
A, B, C (IEC 651 -
TYPE I)
|
| PHANTOM POWER SUPPLY |
200,28,0V
|
| PREAMPLIFIER POWER SUPPLY |
50V
|
| ATTENUATION/GAIN |
-20,0,+20dB
|
| INPUT IMPEDANCE |
100 KOhm
|
| OUTPUT IMPEDANCE |
100 Ohm
|
| MAXIMUM OUTPUT VOLTAGE |
(@1kHz): 25 Vpp
|
| THD (@1kHz) |
0.01%
|
| INPUT NOISE (@20dB gain) |
5uV(LIN), 3uV(A)
|
| DRIVE CAPABILITY |
±7mA
|
| BATTERIES DURATION |
3h (alkaline cells)
|
| SIZE |
12.5x19x5cm
|
| WEIGHT |
900g
|
