Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ (Silver)

Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ (Silver)

Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ (Silver)

B&H # AVVT747SP MFR # VT-747SP
Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ (Silver) Back View

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Product Highlights

  • Twin Signal Path: Tube or Solid-State
  • Stereo Class A Opto-Compressor
  • Stereo Class A 6-Band Passive Program EQ
  • Three Military-Spec 6922 Vacuum Tubes
  • Selectable Pre or Post-Compression EQ
  • Low and High Frequency Side-Chains
  • +36dB of Input Headroom Before Overload
  • Low Noise: -92dB
  • Sealed Silver Relays for All Routing
  • Internal Discrete Regulated Power Supply
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Avalon Design VT-747SP overview

  • 1Description

The Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ is one of those rare signal processors that sounds incredible on every source. It features minimalist routing; utilizing sealed silver relays for all signal and bypass functions. The Twin Signal Path (TSP) makes this unit entirely switchable between tube and solid-state operation.

The Vt-747sp's input gain stage provides versatile tone options right off the bat, especially with the tubes engaged. Unity and lower gain settings will keep the unit sounding clean and warm, allowing the compressor to have a light, transparent touch at lower ratios. If more gain and color is desired, the +10dB switch will instantly add some edge to the sound. With an additional 8dB of gain available above that, the Vt-747sp can push even a quiet signal into the red. In higher gain instances, the compression ratio can be set to feel like a leveler, or it can be increased to a very reactive transient grabber.

With ratios ranging from 1:1 to 20:1, the optical compressor can accomplish anything from subtle gain reduction to hard-knee limiting. Two variable-frequency side-chain filters allow you to tune the compressor's frequency response. A side-chain listen function helps pick out the specific frequencies you want to focus it on. A make-up gain control adds up to 10dB to the signal after compression.

The 6-Band stereo program EQ demonstrates the smooth sound of passive design, and can be placed before or after the compressor in the signal chain. Discrete, Class A high-voltage transistors ensure optimum sonic performance. The fixed frequency turnover, Q and amplitude ranges provide harmonic balance and low phase change.

The final output of the Vt-747sp features a master volume control, which allows you to drive the previous stages to their limit without clipping the inputs of your DAW. It can also provide up to 6dB of boost for quieter signals.

The Avalon Design Vt-747sp Stereo Tube Compressor / 6-Band EQ offers comprehensive tone shaping control over any stereo source.

Twin Signal Path
The Vt-747sp can be used as a tube or solid-state compressor / EQ.
Stereo Class A opto-compressor with spectral control
Compression ratios ranging from 1:1 to 20:1 can be applied with emphasis or de-emphasis on 2 parametric bands of side-chaining EQ.
Class A six-band passive program EQ
A musical fixed six-band EQ provides tone sculpting, pre or post compressor.
Variable threshold, ratio, attack, and release controls
Every parameter of the opto-compressor is user-controllable.
Table of Contents
  • 1Description

Avalon Design VT-747SP specs

Number of Channels Stereo L & R
Inputs Balanced XLR x2
Gain Range 20k ohms, -20 to +16 dB with high gain switch
Maximum Input Level +36 dBu
Output Balanced XLR x2
Maximum Output Level +30 dB balanced @ 600 ohms
Type Optical passive attenuator
Compression Threshold -30 to +20 dB, variable
Compression Ratio 1:1 to 20:1, variable
Attack Time 2 to 200 mS, variable
Release Time 100 mS to 5 seconds, variable
Make-up Gain 0 to +10 dB stereo tracking, variable
Sidechain Variable threshold -15 to +15 dB, frequency 70 to 9,000 Hz twin ranges
EQ Type Discrete Class A, passive design optimized for full range program material
EQ Frequency Bands (Fixed)
  • LF +/-24 dB 15 Hz shelf
  • MF1 +/-8 dB 125 Hz
  • MF2 +/-4 dB 500 Hz
  • MF3 +/-4 dB 2 kHz
  • MF4 +/-10 dB 5 kHz shelf
  • HF +/-20 dB 32 kHz shelf
Topology 3 dual triode vacuum tubes (Sovtek 6922)
High-voltage discrete Class A mode
Frequency Response 1 Hz to 200 kHz (input band limited)
THD 0.5%
Noise -92 dB
VU Meter High quality, illuminated gain reduction meter 0 to -20 dB range
LED Display Twin 20 segment LED VU output meters with -27 to +30 dB range
AC Power Internal toroidal 100 to 240 V, 50-60 Hz selectable, 70 watts maximum
Dimensions (W x D x H) 2U rackmount, 19 x 12 x 3.5 in (48.26 x 30.48 x 8.89 cm)
Weight 22 lbs (9.98 kg)
Packaging Info
Package Weight 25.48 lb
Box Dimensions (LxWxH) 21.5 x 18.0 x 7.5"

Avalon Design VT-747SP reviews

Vt-747sp Stereo Tube Compressor / 6-Band EQ (Silver) is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Accessible High End Product In the last year I've completed a high-end project to semi-pro studio, with the help of B&H and others. Two components that see daily use are the Avalon 737 channel strip, and the 747 Compressor. I chose these products because they are cost effective, the reputation is high, and they are known quantities. The last thing I wanted was an obscure piece of gear that nobody understood, or that was difficult to use; every penny has to be productive on my budget. I have several stereo items that work hard on the mix-down, and also in stereo recording on acoustic guitar tracks. My Avalon purchases have paid off in helping to bring the art to the table, while reducing the heartache of lost productivity, in my lean, clean, dream weaving magic shop.
Date published: 2008-07-22
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