美国DWFearn VT-2话筒放大器

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美国DWFearn VT-2话筒放大器
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2 Y) w0 Z! A  Y1 l, K# R' G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。

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: h$ c9 M8 C8 t- C2 b6 f- K3 TFeatures

All vacuum-tube design

( k7 ^% F( X- S8 H+ eLo-Z input position for superior performance with transformerless mics

Phase (polarity) reverse switch

' h" \5 ?+ f' s' r* j+48 volt phantom power (completely disconnected when off)

. s- a+ f9 W; D/ ~5 B1 j. z3 N& hCustom-design Jensen input and output transformers

/ L& U' u+ q# C8 {  {% `$ k6 `20 dB input pad (switchable)

True VU meters (amplifier isolated)

All point-to-point audio wiring
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Gold input and output XLR connectors
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/ `# G: K: L& ~$ K* b# S* CPolypropylene and polystyrene coupling capacitors
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* W# c/ t# U+ t9 U* [All audio switching through gold-contact, sealed precision relays

International operation on 100, 120, or 220 VAC, 50/60 Hz

- L* F7 ?3 `" P6 V3 n1 N% C& u7 XCE certified, RoHS-compliant
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7 ]% a: s, D/ ~9 g2 c! j+4 dBm output
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Conservatively rated precision components and rugged construction for stability and long life

Specifications
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$ J3 l7 |; V. pInput 150 ohms
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! @: X% S1 C  {Input Load Impedance 1.5k ohms
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Minimum Input Level -65 dBm nominal
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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

+ m* Y! C; o$ C8 H5 D- a  Z0 y( @THD+Noise less than 0.25% 20 cps to 20 kc

6 B; w# f6 {3 I2 p) g; S$ y" xIntermodulation Distortion SMPTE less than 0.02%
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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
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Power Requirements 100, 120, or 220 VAC, 50/60 Hz

0 Q% x" I/ F/ u1 ODimensions 19” (48.26cm) W, 5.25” (13.34cm) H, 14” (35.56cm) D

3590123

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