Avalon Design VT-747SP Stereo Compressor

The Avalon VT-747SP Stereo Compresser. Vacuum-tube warmth and presence with solid-state flexibility.

The Avalon VT-747SP combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies in 2 rackspaces. Choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications.

The main features of the Avalon VT-747SP include:

• Stereo Class A 6-band discrete passive program EQ
• TSP twin signal path, vacuum tube bypass
• Low noise -92dB
• Fully balanced Class A input and DC coupled outputs
• Stereo dynamic 60dB high resolution output meters
• High-quality analog VU meter for gain reduction
• High headroom +36dB input before overload
• Spectral side-chain monitor for pre listen
• EQ pre-post selection for opto-compressor
• Sealed silver relays for all signal routing
• Internal discrete regulated power supplies
• Military spec vacuum tubes for long life and low noise

The main specifications of the Avalon VT-747SP include:

• Circuit topology: 3 dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A mode
• Input gain range: Balanced, Class A, 20kOhms, -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-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
• Sidechain 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, MF1 +/-8dB 125Hz selected Q response, MF2 +/-4dB 500Hz selected Q response, MF3 +/-4dB 2kHz selected Q response, MF4 +/-10dB 5kHz shelf response, HF +/-20dB 32kHz shelf response
• AC power: Internal toroidal 100V to 240V, 50-60Hz selectable, 70 watts maximum
• Dimensions: 19 x 12 x 3-1/2 inches (482 x 305 x 89mm)
• Weight: 22 lbs. (10kg)
• Weight-packed: 26 lbs. (11.8kg)