La firma estadounidense VAC, culmina una investigación de ocho años, desarrollando el mejor preamplificador jamás fabricado por la marca.
Como características de diseño podemos destacar, la ausencia de condensadores de acoplamiento de entrada a salida y la no utilización de bucles de retroalimentación negativa.
Especificaciones:
- Inputs: 3 sets RCA line input, 2 sets balanced/RCA selectable inputs; optional 1 MM and 1 MC (or additional line input if phono is not fitted); 1 set RCA tape monitor input; 1 set RCA cinema bypass input
- Outputs: 2 sets RCA, 2 set balanced XLR (EIA «pin 2 hot» studio standard); 1 set RCA tape output
- Optional MM/MC phono stage with user adjustable loading
- Absolute phase is correct from all inputs to all outputs
- Dimensions: audio chassis 18″ wide x 5.5″ high x 14.5 deep (plus knobs & connectors); power supply 18″ x 3.9″ x 14.5″ plus connectors
- Shipping weight: 61 pounds total (with phono)
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- Line stage:
- Two 12AU7 twin triodes and two 8416, 7308, 6922, E88CC, ECC88, 6DJ8, or 12DJ8 twin triodes
- Gain: 12 dB
- Frequency response: flat over audio band; -3 dB bandwidth 5 Hz – 210 kHz
- THD: <0.009% @ 1 kHz, 1 V RMS
- Maximum output: > 8 V RMS
- Output impedance: 96 ohms, 20 Hz – 20 kHz, static (i.e., not dependent upon feedback)
- Recommended output load: >300 ohms
- Channel separation: >80 db
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- Phono stage:
- Six 12AX7 twin triodes
- Gain: 44 dB MM / 64 dB MC selectable
- MC load impedance selectable, 470, 300, 250, 200, 150, and 100 ohms
- MM load impedance selectable, 47k, 30k, 25k, 15k, and 10k ohms
- Frequency response: RIAA standard +/- 0.2 dB (20 Hz – 20 kHz); -3 dB bandwidth 10 Hz – 80 kHz
- Maximum input: > 130 mv @ 1 kHz, MM; > 13 mv, MC
- Channel separation: > 80 db @ 1 kHz
