Avalon VT737SP Direct Signal Path Channel Strip
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 will add warmth, clarity and character to your recordings. Avalon designers combined a high-quality Class A mic preamp, opto-compressor, sweep EQ and reliable VU metering in a powerful 2 rack-space channel strip. Use it as a front end to your digital recording gear and you will hear the difference! Preamplifier 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. 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-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. Sweep Equalizer and Output Level 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. Features: Vacuum tube triode signal pathTransformer balanced microphone inputHigh-voltage circuits for maximum headroom to +30dBLow noise -92dB, internal discrete power supply with toroidal transformerSoft-start tube life extenderStereo link for compressorsAll discrete Class A equalizer with musical passive filter designSealed silver relays for signal routingLarge control knobs with professional conductive plastic potentiometersVU meter for output level monitoring and compressor gain reduction 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 Microphone26dB @ 25Hz, +30dB @ 1kHz balanced XLR Instrument+30dB unbalanced front panel jack socketLine +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 to20dB 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
| Model |
VT737SP Microphone Preamp |
| Series |
VT Series |
| Dynamic Range |
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 |
| Number of Channels |
1 |
| Phantom Power |
Yes |
| Audio Connections |
Balanced XLR connections for Mic In, Line In and Line Out. 1/4 inch Hi-Z Instrument Input on front |
| Presets |
None |
| Sampling Rate |
None |
| Signal to Noise Ratio |
-116dB, 22Hz to 22kHz unweighted |
| Compression |
Yes |
| MIDI Connections |
No |
| Power Supply |
Internal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximum |
| EQ |
Yes |
| Frequency Response |
(-/2.5dB) 10Hz to 120kHz input filter included; (-3dB) 1Hz to 200kHz line in-out |
| Sync or Timecode |
No |
| Display Type |
VU Meter |
| Effects |
No |
| Product Weight |
22 lbs |
| Dimensions |
19"W x 12"D x 3.5"D |
6/16/2006 4.0do tubes equal better? By Anonymous from Undisclosed By Anonymous from Undisclosed By Anonymous from Undisclosed By Anonymous from Undisclosed By Anonymous from Undisclosed
Avalon VT737SP Direct Signal Path Channel Strip
The manufacturer’s warranty covers parts and labor for one year from date of purchase. The warranty excludes damage from misuse, abuse, and contains other exclusions.
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