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.
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)
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)
The Gear Rack