Solid State Logic Alpha VHD 4-channel Microphone Preamp
Solid State Logic Alpha VHD 4-channel Microphone Preamp Solid State Logic Alpha VHD 4-channel Microphone Preamp

Solid State Logic Alpha VHD 4-channel Microphone Preamp


Four-Channel Mic Pre with attitude


The Alpha VHD-Pre offers four of SSL’s widely acclaimed VHD Pre circuits in compact 1U format. First featured on our flagship Duality console and now the go to circuit for leading engineers worldwide, the VHD Pre is a patented SSL preamp design that can deliver ultra-clean SSL grade recordings but also features a patented ‘Variable Harmonic Drive’ circuit which can be switched into the signal path.


Available for Demo


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Change your expectations of what a preamp should be

The Variable Harmonic Drive circuit uses a 100% analogue signal path to generate rich harmonic distortion. As you increase the input gain, the Variable Harmonic Drive circuit introduces either 2nd or 3rd harmonic distortion or a blend of the two to your source material. At lower gain settings it adds gentle valve-style warmth or a touch of transistor edge. As the gain is increased the more extreme the distortion becomes until at high gain settings it delivers fierce trashy transistoresque grunge. VHD pre’s give the user ultimate versatility from a studio grade preamp. Whether it’s ultra-clean traditional SSL, subtle warming or totally trashy transistor distortion. VHD delivers a uniquely versatile pallette of rich analogue character that can be applied as a mic pre, instrument DI or line level processing device.


Each Pre is a simple analogue device with XLR in/out on the back, an instrument level 1/4″ jack on the front panel. Each circuit has a Hi Z switch to accommodate mic, line and instrument level signals, a PAD switch to facilitate use as a line level processing device and 48v phantom power switch. There are three rotary controls: Input Level, VHD and Output Level.


Key Features

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 Specifications

  • Preamp Type:Solid State
  • Number of Channels:4
  • Phantom Power:Yes
  • Analog Inputs:4 x XLR (Mic), 4 x 1/4" (Hi-Z)
  • Analog Outputs:4 x XLR
  • Rack Spaces:1U
  • Height:1.75"
  • Depth:9"
  • Width:19"
  • Weight:6 lbs.
  • Manufacturer Part Number:729998X1