Avalon Design VT747SP Black


Stereo tube-discrete Class A spectral-opto-compressor with six band program equalizer, L-R output level and gain reduction metering.

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Avalon Design


Avalon Design VT747SP Black

Avalon Design VT747SP Black: TESTIMONIALS

“The Avalon Design VT747SP Black is a brilliant and innovative design with an incredible compressor and sweet no-nonsense EQ. With TSP engaged mixes are fat and rich with harmonics. The Vt-747sp is very versatile and is an awesome finishing processor across the stereo buss during mixdown. I also plan to use it during direct to tape recording of stereo keyboards and for project studio mastering. It has a unique and distinctive sound and looks great too.” – Dale P., CA

“The Vt-747sp is the fattest and cleanest sounding piece I’ve ever heard!” – Scott S., FL

“I just wanted to let you to know that you guys make great front of house gear! I have a Vt-747sp across the buss mix on the house console and I love it! The 32k EQ really opens up the P.A. Thanks for the great gear, keep up the good work.” – Eric C., MO

“I am using the Vt-747sp as a mastering tool in my sound system. The effect has been dramatic. I even have ordinary punters telling me the sound is great. Best wishes from Ireland.” – Tony H., Ireland

The Avalon Design VT747SP Black combines a creative STEREO tube-discrete Class A spectral-opto-compressor with a musical six band program equalizer, L-R output level and gain reduction metering and internal regulated power supplies in a 2U space. Ideal for high performance DAW input signal conditioning, stereo buss compression-EQ, stereo keyboards and analog mastering applications.


The opto-compressor features a minimum signal path design utilizing sealed silver relays for all signal routing and by pass functions. The optical attenuator acts as a passive level controller with a Class A, variable gain make-up amplifier. Full dynamic control from soft compression to hard-knee limiting can be achieved with master threshold, ratio-compression, attack and release controls. Gain reduction indication is a large analog VU meter. Low frequency and high frequency contour parametric spectral controls can be routed into the side-chain path for enhanced frequency dependent compression with variable frequency and threshold levels. SC listen provides side-chain listen mode for monitoring.


The Avalon Design VT747SP Black equalizer utilizes 100% discrete, Class A high-voltage transistors for optimum sonic performance. The six band STEREO program EQ incorporates the smooth characteristics of an all passive design. The frequency turnover, Q and amplitude ranges have been carefully chosen for each band to provide the most natural harmonic balance and lowest phase change while offering simple and effective tone control. The EQ can be placed pre or post the opto-compressor for enhanced effects.


The VT-747SP features TSP which gives you the choice of either tube tone or the classic, Class A discrete transistor sound by exchanging, three (3) high-voltage dual triode tubes with discrete amplifiers in the opto-compressor and primary output stages.


Fully balanced DC coupled, Class A discrete amplifiers are utilized for the input and output drive interface with+36dB input headroom. A high quality analog VU meter indicates accurate gain reduction. Twin 60dB range LED meters provide fast L-R output status of all levels.

Avalon Design VT747SP Black VT-747SP SPECIFICATIONS

Circuit topology Three (3) dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A mode.
Input gain range Balanced, Class A, 20k ohms, -20dB to +16dB with high gain switch
Maximum input level +36dB balanced XLR pin 2 hot
Maximum output level +30dB balanced 600 ohms, DC coupled, discrete Class A
Output type XLR connector, output trim gain -45dB to +6dB
Noise 20kHz unweighted -92dB
Distortion THD, IMD 0.5%
Frequency response -3dB 1Hz to 200kHz
Gain reduction meter High quality, illuminated gain reduction meter 0dB to -20dB range
Output meter Twin 20 segment LED VU meters with -27dB to +30dB range
Compressor type Optical passive attenuator
Make-up gain Variable 0dB to +10dB stereo tracking
Threshold – Ratio Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1
Attack – Release Attack variable 2mS to 200mS, release variable 100mS to 5 seconds
Side-chain spectral contour Variable threshold -15dB to +15dB, frequency 70Hz to 9kHz twin ranges
Equalizer type Discrete Class A, passive design optimized for full range program material
Frequency bands (6) Variable amplitude LF +/-24dB 15Hz shelf response
Variable amplitude MF1 +/-
dB 125Hz selected Q response
Variable amplitude MF2 +/-4dB 5
0Hz selected Q response
Variable amplitude MF3 +/-4dB 2kHz selected Q response
Variable amplitude MF4 +/-
dB 5kHz shelf response
Variable amplitude HF +/-
dB 32kHz shelf response
AC power Internal toroidal 100v to 240v, 50-60Hz selectable, 70 watts maximum
Dimensions 19 x 12 x 3.5 in (482 x 305 x 89mm)
Weight 22lbs (10kg)
Dimensions-shipping carton 21 x 18 x 8 in (533 x 457 x 203mm)
Weight-packed 26lbs (11.8kg)

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