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Предварительный усилитель Nagra CLASSIC PREAMPПроизводитель: NagraПредварительный усилитель с блоком питания. 
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Характеристики Nagra CLASSIC PREAMP
| Frequency response: | 10 Hz – 50 kHz (+0 / -0.5 dB) | |
| Dynamic range: | >125 dB (Gain at +12 dB) | |
| Minimum input level to reach 0 dB (meter) | 0.28 V rms (Gain at +12 dB) | |
| Maximum input level to reach 0 dB (meter) | >25 V rms (Gain at 0 dB) | |
| Crosstalk: | >85 dB | |
| Total harmonic distortion (THD) | <0.01% at 1 kHz out, no load | |
| Input impedance: | 50 KΩ | |
| Output impedance: | 6 Ω | |
| Vacuum tubes (selected by Nagra Laboratory): | 2x 12AX7 / ECC83 | |
| 1x 12AT7 / ECC81 | ||
| Power consumption: | 12 V 1040 mA | |
| < 1o mW in standby | ||
| Power supply: | 115 V or 230 V AC input | |
| Inputs: | XLR | |
| RCA 1 to 4 | ||
| Outputs: | 2 x XLR | |
| 1 x RCA | ||
| Dimensions: | 379 x 277 x 76mm (12.2 x 10 x 3 inches) | |
| Weight: | 4.9 Kg (10.8 lbs) |