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Avalon VT-737SP - Direct Recording Channel - Demo Unit, from Avalon

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Avalon VT-737SP - Direct Recording Channel - Demo Unit Avalon VT-737SP - Direct Recording Channel - Demo Unit
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Avalon VT-737SP - Direct Recording Channel - Demo Unit
Avalon VT-737SP - Direct Recording Channel - Demo Unit

The best selling channel strip on the market, with amazing sonics, and a really low price point compared to the competition.  This is a demo/open box unit with full factory warranty.

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What we think:

Of the high-end single-channel all-in-one boxes, there is no question that the Avalon VT-737sp is not only the best selling one, but perhaps also has the best value. In its class it is the least expensive box, competing with strips that retail for much more. Featuring a four tube design, the Avalon 737's superb preamp, EQ, and compressor offer a very nicely textured, subtle, soft, and warm sound. As tube equipment goes, the 737 is still quite detailed and clean... but keep in mind it has four tubes!

Description:

The Avalon VT-737SP features a combination of TUBE preamplifiers, opto-compressor, sweep equalizer, output level and VU metering in a 2U space.

The VT-737SP has three input selections: 1. The VT-737SP features a higher-performance microphone input transformer with +48v phantom selection. 2. Instrument DI high source input with jack located on front panel. 3. 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.

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-ess 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 VT-737SPs 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.

The VT-737SP 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.

Vacuum tube triode signal path, transformer balanced microphone input, high-voltage circuits for maximum headroom to +30dB, low noise -92dB, internal discrete power supply with toroidal transformer, soft-start tube life extender, stereo link for compressors, all discrete Class A equalizer with musical passive filter design, sealed silver relays for signal routing, large control knobs with professional conductive plastic potentiometers, VU meter for output level monitoring and compressor gain reduction.

Specs:

  • 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: Microphone26dB@25Hz, +30dB@1kHz balanced XLR Instrument+30dB unbalanced front panel jack socket, Line +36dB balanced XLR
  • Maximum output level: +30dB balanced 600 ohms, DC coupled, discrete Class A
  • Output type and gain XLR connector, output trim gain -45dB to 20dB
  • Noise 20kHz unweighted -92dB
  • Noise microphone EIN: -116dB, 22Hz to 22kHz unweighted
  • 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 and gain reduction: High quality illuminated OVU =+4dB and gain reduction to -20dB
  • High cut filter: Variable 6dB per octave 30Hz to 140Hz 
  • Compressor type: Optical passive attenuator incorporating twin vacuum tubes and stereo link
  • 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
  • Equalizer type: Discrete Class A, variable active and 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

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