美国DWFearn VT-2话筒放大器
美国DWFearn VT-2话筒放大器在设计VT前置放大器时，不允许在声音质量，可靠性或坚固性方面做出任何妥协。与20世纪50年代和60年代的电子管设备一样，VT前置放大器采用重型铝制机箱，采用点对点布线。选择每个真空管以获得***小的噪音和微音，以及的声音清晰度。前面板开关控制密封的金触点精密继电器，用于所有音频切换，消除了脏接触降低声音和***小化内部音频路径的可能性。每个通道中的四个A类三极管放大器部分（在两个管中）包括整个有源电路。这个令人惊讶的简单电路，以及高品质的元件和精心的设计优化，带来了VT前置放大器的声音优势。
Features
All vacuum-tube design
Lo-Z input position for superior performance with transformerless mics
Phase (polarity) reverse switch
+48 volt phantom power (completely disconnected when off)
Custom-design Jensen input and output transformers
20 dB input pad (switchable)
True VU meters (amplifier isolated)
All point-to-point audio wiring
Gold input and output XLR connectors
Polypropylene and polystyrene coupling capacitors
All audio switching through gold-contact, sealed precision relays
International operation on 100, 120, or 220 VAC, 50/60 Hz
CE certified, RoHS-compliant
+4 dBm output
Conservatively rated precision components and rugged construction for stability and long life
Specifications
Input 150 ohms
Input Load Impedance 1.5k ohms
Minimum Input Level -65 dBm nominal
Maximum Input Level @ 20 cps -30 dBm without pad, -5 dBm with 20 dB pad
Gain 53 dB
Frequency Response +/-0.25 dB 20 cps to 20 kc; -3 dB @ 0.5 cps and 55 kc
THD+Noise less than 0.25% 20 cps to 20 kc
Intermodulation Distortion SMPTE less than 0.02%
Signal to Noise Ratio 74 dB minimum
Equivalent Input Noise -124 dBm maximum
Output low-Z, transformer-balanced
Maximum Output Level +22 dBm, 20k ohm load
Power Requirements 100, 120, or 220 VAC, 50/60 Hz
Dimensions 19” (48.26cm) W, 5.25” (13.34cm) H, 14” (35.56cm) D
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