Solid State Logic Alpha VHD 4-Channel Microphone Preamp

  • Item # 1009838
  • Model # 729998X2

The XLogic Alpha VHD is a four-channel analog microphone preamp with attitude. Whether you need to track pristine vocals, crunched drums or electric guitars on the edge of sonic destruction, the Solid… Learn More


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SSL front end for your DAW featuring four preamps and sound-shaping circuitry from the SSL Duality console.


  • Ultra-clean, high-grade mic preamps with line and instrument level switching
  • Four independent Variable Harmonic Drive (VHD) circuits
  • VHD - a time machine of overdrive characteristics
  • 100% analog signal path
  • Ultra-clean SSL preamp with 75dB of gain
  • 48V phantom power
  • 20dB Pad switches that illuminate to indicate overload
  • Hi Z switches to accommodate mic, line and instrument level signals
  • Four independent Variable Harmonic Drive systems
  • Front panel 1/4" jack instrument/line level inputs with passive DI type impedance detection and level matching
  • Individual input, output and VHD controls for each section
  • Rear panel XLR mic/line inputs and XLR outputs

Technical Specification

Solid State Logic Alpha VHD 4-Channel Microphone Preamp


  • Power Supply: IEC320 3-pin connector, 100 ”240 Vac, 50 ”60 Hz
  • Analog I/O:
  • Microphone Balanced, 3-pin XLR-F, Zin = 1k Ohms (10k Ohms for Hi Z)
  • Instrument Un-balanced, 1/4" Mono Jack, Zin = 1M Ohms
  • Output Balanced, 3-pin XLR-M, Zo = 40 Ohms
  • Power 5-pin 180 DIN connector, +5Vdc, ±15Vdc


  • Depth: 9" casing only (230mm)
  • Height: 1.75" (1 RU) (44.5mm)
  • Width: 17.25" casing only (438mm)
  • 482mm / 19" inc' rack ears
  • Weight 6 pounds (2.6kg)
  • Power < 20 Watts