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Avalon VT737SP Class A Tube Channel Strip

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Product Description

The Avalon VT737SP features a combination of TUBE preamplifiers, opto-compressor, sweep EQ, output level and VU metering.
VT737SP's preamp provides a 48V phantom powered input, an Instrument DI and a balanced line input. The Opto-compressor features twin Class A tube triodes for gain matching. Full dynamic control from soft compression to hard-knee limiting can be achieved with threshold, ratio-compression, attack and release controls plus gain reduction selection on the large VU meter. Special spectral control including de-ess is available with the dual sweep mid EQ to side-chain switch. The EQ section can be flipped pre or post-compressor. The high and low EQ bands provide the smooth characteristics of an all passive design, while the dual mid bands include variable frequency and switched Q-width selection. Whether you're recording a solo vocalist or an acoustic instrument, mastering, or recording symphonies, let Avalon take you to the leading edge in analog and experience sonic reality like never before!

Avalon VT737SP Features
  • Vacuum tube triode signal path
  • Soft-start tube life extender
  • Stereo link for compressors
  • Sealed silver relays for signal routing
  • Transformer balanced microphone input
  • High-voltage circuits for max headroom and low noise
  • Discrete Class A equalizer with musical passive filter
  • Internal discrete power supply with toroidal transformer
  • Large control knobs with professional conductive plastic potentiometers
  • VU meter for output level monitoring and compressor gain reduction

Preamplifier
The VT737SP has three input selections:
  1. A higher-performance mic input transformer with +48v phantom selection
  2. An instrument DI high source input with jack located on front panel
  3. A balanced line input, discrete high-level Class A
The Class A preamplifier utilizes two cascaded, dual vacuum tube triodes configured with minimum negative feedback. A high gain switch boosts the overall gain of the preamplifier. The four high quality tubes are configured as singled ended anode coupled followers. A passive-variable high pass filter and hard-wire relay bypass completes the input signal conditioning. The phase reverse relay is available on all three inputs.

Opto-Compressor
The opto-compressor features a minimum signal path design with twin Class A vacuum tube triodes for gain matching. The optical attenuator acts as a simple passive level controller. Full dynamic control from soft compression to hard-knee limiting can be achieved with threshold, ratio-compression, attack and release controls plus gain reduction selection on the large VU meter. Special spectral control including de-essing is available with the dual sweep mid EQ to side-chain switch. The EQ section can be flipped pre or post the opto-compressor via a front panel switch for alternate effects and tone shaping. Two VT737SPs can be linked via a rear panel link cable for stereo tracking. The compressor bypass is a sealed silver relay for the most direct signal path.

Sweep-Equalizer and Output Level
The VT737SP equalizer utilizes 100% discrete, Class A-high-voltage transistors for optimum sonic performance. The high and low frequency bands provide the smooth characteristics of an all passive design, while the dual mid bands include variable frequency and switched Q-width selection. The enhanced range of the mid bands is extended into the high and low bands by the use of x10 frequency multipliers. The bypass switch incorporates a sealed silver relay for the most direct signal path. When the EQ to sidechain is engaged, the high-low EQ remains in the audio path for tone enhancement. The output level control provides a variable control of the overall signal path. The output amplifier utilizes another dual triode vacuum tube driving a 100% discrete, Class A, high-current, balanced and DC coupled low noise output amplifier.

Product Specifications
Avalon VT737SP Class A Tube Channel Strip Specifications
  • Circuit topology:
    • Four dual triode vacuum tubes (Sovtek 6922)
    • High-voltage discrete Class A
  • Gain Range:
    • Microphone: Transformer balanced 850/2500 ohm, 0dB to +58dB
    • Instrument: Unbalanced 1 meg ohm, 0dB to+30dB
    • Line: Balanced Class A 20k ohms, -27dB to 28dB
  • Maximum input level and connector types:
    • Microphone: 26dB@25Hz, +30dB@1kHz (balanced XLR)
    • Instrument: +30dB (unbalanced front panel 1/4 inch jack)
    • Line: +36dB (balanced XLR)
  • Maximum output level: +30dB balanced, 600 ohms, DC coupled
  • Output type: 1/4 inch balanced connector
  • Output gain: -45dB to20dB
  • Noise: 20kHz unweighted (-92dB)
  • Noise microphone EIN: 22Hz to 22kHz unweighted (-116dB)
  • Distortion THD, IMD: 0.5%
  • Frequency response -/2.5dB: 10Hz to 120kHz input filter included
  • Frequency response -3dB: 1Hz to 200kHz line in-out
  • VU meter: High quality illuminated OVU (+4dB)
  • Gain reduction: up to -20dB
  • High cut filter: Variable 6dB per octave 30Hz to 140Hz
  • Compressor type: Optical passive attenuator with twin vacuum tubes/stereo link
  • Threshold: -30dB to +20dB (variable)
  • Ratio-compression: 1:1 to 20:1 (variable)
  • Attack: 2mS to 200mS (variable)
  • Release: 100mS to 5 seconds (variable)
  • Equalizer type:
    • Discrete Class A
    • Variable active
    • Switched passive design
  • Frequency bands (4):
    • Treble: Switched 10kHz, 15kHz, 20kHz, 32kHz, +/- 20dB range, shelf
    • High Mid: variable 200Hz to 2k8Hz and 2kHz to 28kHz, +/-16dB range, hi-lo Q
    • Low Mid: variable 30Hz to 450Hz and 300Hz to 4k5Hz, +/-16dB range, hi-lo Q
    • Bass: Switched 15Hz, 30Hz, 60Hz, 150Hz, +/- 24dB range, shelf
  • AC power:
    • Internal toroidal
    • 100v to 240v
    • 50-60Hz selectable
    • 75 watts maximum
  • Dimensions: 19 x 12 x 3.5 inches (482 x 305 x 89 mm)
  • Weight: 22 lbs (10 kg)


Helpful Info about the Manufacturer
Phone:  949-492-2000 Warranty: 
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