Tube channel strip

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With the tube channel strip series, a microphone, line and instrument preamplifier with passive EQ, QES offer for the professional audio recording market reaches the highest levels.
PREQ-1: a Microphone-Line preamplifier with a passive LC Pultec-style EQ.
The two independent inputs and two independent outputs greatly increase the versatility of this piece of equipment, allowing a more flexible use of the two units (Preamp and EQ), which can be operated individually or simultaneously, widening the choice for your demanding applications.

An all valve-based equipment, entirely hand-crafted.

The components used are all selected with the strictest tolerance, and tested by ear.


  • Microphone-line-instrument preamplifier, operated independently or in series
  • Tube microphone preamplifier, LC passive equalizer
  • Last generation solid state independently filtered and regulated plate and filament power supplies for minimum noise
  • All tube audio circuitry
  • Active Hi-Z Instrument input
  • 2-band parametric EQ (Pultec EQP-1A style)
  • Fixed EQ frequency selections for total recall
  • Transformer balanced audio signal route
  • Special High Mu Nickel core custom wound audio transformers
  • Doubled copper deposit P.C.B., cutting trace resistance in half, for an improved signal integrity
  • Ruggedized stainless steel 2U high chassis, rackmount
  • Frequency response absolutely flat over the entire audio range and beyond

Technical specifications

  • Frequency response (+0/-1dB) : 20Hz — 45kHz
  • C.M.R.R., 1kHz: >60dB
  • Signal/noise ratio, ref. +20dBu, unwtd, 20kHz BW, 10kΩ load: ›80dB
  • Maximum output level, THD 1%, load 10kΩ: +26dBu
  • Mic input impedance: 1kΩ
  • Line input impedance: 600Ω
  • Instrument D.I. input impedance: 5 MΩ
  • Direct output impedance: 600Ω
  • EQ/Main output impedance: 600Ω
  • Max Output level (MOL), mic preamp, gain 43.5dB, Rload 10kΩ, onset of clipping, direct output:  27.5dBu
  • MOL EQ section, Rload 10kΩ, main output, onset of clipping: +30dBu
  • Dimensions (W x H x D) inches : 19 x 3.46 x 11.81
    mm: 483 x 88 x 300
  • Net weight: 10kg (22 lbs)
  • Shipping weight: 12kg (26.45 lbs)


Product inquiry

To inquiry for this product, request for a quote, send us an email, including your location and ZIP code.