Avalon

The Avalon VT-737SP is a channel strip featuring a combination of tube preamplifiers, opto compressor, sweep equalizer, output level and VU metering in a 2U space.PREAMPLIFIERThe VT-737SP has three input selections:The VT-737SP features a higher-performance microphone input transformer with +48V phantom selectionInstrument DI high source input with jack located on front panelBalanced line input, discrete high-level Class AThe 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 COMPRESSORThe 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 LEVELThe 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 +30 dBLow noise -92 dBInternal 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

Avalon DI-preamplifiers have been in use around the world since 1985. They have found their way into the world's leading musicians rigs and recording sessions and have been featured on thousands of the best selling (and sounding) albums, downloads and live performances. The V55 includes the best of the Avalon U5 DI functions with two studio quality preamplifiers and "a new sonic addition". Two alternate solid-state topologies are cascaded to provide a rich, low midrange harmonic content not offered in other Avalon preamplifiers. This feature empowers the V55 with a new scale of sonic character.Features:Dual Mono, Pure Class A, 100% discrete designForward musical detail and sonic excellenceMinimum audio signal path with 10 position extended range TONE-BANK™High quality transformer input & isolated outputMicrophone and Hi-Z inputs to +36dBVery low noise -100dBHigh headroom +30dBSwitched 2dB, high-gain preamplifer to +66dBDC coupled Pure Class A outputLarge illuminated professional VU meterTwin LED peak signal indicatorsRegulated +48v phantom power supplyLow distortion less than 0.5% THD and IMDVariable passive high pass (bass cut) filterAll signal routing with sealed silver relaysSonic Excellence The Avalon V55 DI-RE-MIC Preamplifer is an ultra-high performance professional dual channel preamplifier, DI and RE-amper. Created for maximum versatility, the V55's sonic signature - "Deep and Controlled Bass, Musical Mid-range and enhanced Vocal Projection" combine with a unique set of user features including, 100% discrete Pure Class A amplification, Avalon's unique "passive" TONE-BANK™, professional VU meter with dual peak LED's, multiple outputs including an instrument level transformer isolated Re-amp. Designed to optimize absolute signal integrity and musical performance, the V55 is ideal for ribbon, dynamic and condenser microphones, bass guitar, acoustic instruments, electric guitars, keyboards, synthesizers, and very low output passive pickups. The state-of-the-art DI input stage provides a very-high inpedance, "zero-load" effect on sensitive pickups and keyboards, while maintaining massive input headroom to +36dB before overload.Minimum Signal Path Design The V55 includes a very high quality input transformer (same as the Avalon VT-737sp) with dual microphone input impedance loading for perfect mic/cable matching, high-cut switch for eliminating unwanted acoustic pickup and high frequency noise, headphone monitor amp and DC coupled, 100% Class A output amplifiers for defined bass control. A buffered "thru" output for zero-instrument-load tuners or power amp inputs, internal toroid power transformer with discrete high-voltage power supplies for low noise and sealed silver relays for transparent signal routing.

Avalon V5 Silver, 1 channel pre-amp, high-voltage design, Pure Class A, multi-purpose instrument, line and microphone pre-re-amplifier, low noise, high-gain, Pure Class A, microphone preamplifier with dual impedance ideal for ribbon-dynamic and high level condenser microphones, 10 meg.Ohms instrument DI input with zero impedance loading. Ideal for sensistive acoustic pickups together with a +36dB maximum input capability, transformer isolated REAMPING  output offers multiple input-output configuarations with ALL inputs available, including polarity reverse, PASSIVE TONE selector allows ten contours (six from the U5 tone bank) including two passive high pass filters and two vocal-instrument enhanced passive AIR-LIFT low frequency curves.  Additional features include  a passive low pass hiss & buzz filter, a wide range, professional analog VU meter with expanded scale -30dB to +18dB with twin peak LED’s for fast signal capture, Color: Silver.

Avalon V5 Silver, 1 channel pre-amp, high-voltage design, Pure Class A, multi-purpose instrument, line and microphone pre-re-amplifier, low noise, high-gain, Pure Class A, microphone preamplifier with dual impedance ideal for ribbon-dynamic and high level condenser microphones, 10 meg.Ohms instrument DI input with zero impedance loading. Ideal for sensistive acoustic pickups together with a +36dB maximum input capability, transformer isolated REAMPING  output offers multiple input-output configuarations with ALL inputs available, including polarity reverse, PASSIVE TONE selector allows ten contours (six from the U5 tone bank) including two passive high pass filters and two vocal-instrument enhanced passive AIR-LIFT low frequency curves.  Additional features include  a passive low pass hiss & buzz filter, a wide range, professional analog VU meter with expanded scale -30dB to +18dB with twin peak LED’s for fast signal capture, Color: Silver.

The U5 high-voltage DI-preamp combines a unique passive tone selector with a variable gain preamp and filter. The high input impedance accepts a wide variety of signal levels and instruments from acoustic guitars to high-output active bass guitars and keyboards. The U5 direct box is loaded with sonic character and user features professionals demand.        FEATURESPure Class A, 100% discrete design Smooth musical detail and sonic excellence Variable gain preamp to +30dB. Dual microphone and line outputs Hi-Z   3,000,000 ohm input impedance Very low noise -100dB High headroom +30dB Six tone bank selections. DC coupled Class A output for superior bass High cut switch eliminates noise LED active signal indicator Headphone monitor output jack Low distortion less than 0.5% THD and IMD High level 400 watt speaker input Active to thru selector - ground isolation switch 100% discrete power supplies for audio path Internal toroidal power supply for low noise Long lasting, stainless steel hardware 

The U5 high-voltage DI-preamp combines a unique passive tone selector with a variable gain preamp and filter. The high input impedance accepts a wide variety of signal levels and instruments from acoustic guitars to high-output active bass guitars and keyboards. The U5 direct box is loaded with sonic character and user features professionals demand.        FEATURES Pure Class A, 100% discrete design Smooth musical detail and sonic excellence Variable gain preamp to +30dB. Dual microphone and line outputs Hi-Z   3,000,000 ohm input impedance Very low noise -100dB High headroom +30dB Six tone bank selections. DC coupled Class A output for superior bass High cut switch eliminates noise LED active signal indicator Headphone monitor output jack Low distortion less than 0.5% THD and IMD High level 400 watt speaker input Active to thru selector - ground isolation switch 100% discrete power supplies for audio path Internal toroidal power supply for low noise Long lasting, stainless steel hardware 

The Avalon VT737 SP Tube Voice Channel, delivers impeccable clarity with tube warmth and presence for your mic, instrument or line mono channel.The Avalon VT737 SP Mono Mic Pre/Compressor/EQ is a combination tube preamp, opto-compressor and sweep equalizer, with output level and VU metering in 2 rackspaces. Balanced mic, front-panel instrument DI, and balanced line inputs. Class A preamp uses 2 cascaded, dual vacuum-tube triodes configured with minimum negative feedback. The Avalon Vt 737sp has a high-gain switch, high-pass filter, and hardwire relay bypass..The main features of the Avalon VT737 SP include: Tube preampOpto-compressorSweep equalizerOutput level controlVU meteringBalanced mic input, front-panel instrument DI, and balanced line inputsHigh-gain switchHigh-pass filterHardwire relay bypass The main specifications of the Avalon VT737 SP include:Circuit topology: 4 dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class AGain Range Microphone: Transformer balanced 850/2500 ohm, 0dB to +58dB Instrument: Unbalanced 1 meg ohm, 0dB to +30dBLine: Balanced Class A 20k ohms, -27dB to 28dBMaximum input level and connector types: Microphone26dB@25Hz, +30dB@1kHz balanced XLR Instrument+30dB unbalanced front panel jack socketLine +36dB balanced XLRMaximum output level: +30dB balanced 600 ohms, DC coupled, discrete Class AOutput type and gain: XLR connector, output trim gain -45dB to20dBNoise 20kHz unweighted: -92dBNoise microphone EIN: -116dB, 22Hz-22kHz unweightedDistortion THD, IMD: 0.5%Frequency response -2.5dB: 10Hz-120kHz input filter includedFrequency response -3dB: 1Hz-200kHz line in-outVU meter and gain reduction: High quality illuminated OVU =+4dB and gain reduction to -20dBHigh cut filter: Variable 6dB per octave 30Hz-140HzCompressor type: Optical passive attenuator incorporating twin vacuum tubes and stereo linkThreshold - Ratio: Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1Attack - Release: Attack variable 2mS to 200mS, release variable 100mS to 5 secondsEqualizer type: Discrete Class A, variable active and switched passive designFrequency bands (4): Treble - switched 10kHz, 15kHz, 20kHz, 32kHz, +/-20dB range, shelf High mid - variable 200Hz-28kHz and 2kHz -28kHz, +/-6dB range, hi-lo Q Low mid - variable 30Hz-450Hz and 300Hz-4k5Hz, +/-16dB range, hi-lo Q Bass - switched 15Hz, 30Hz, 60Hz, 150Hz, +/-24dB range, shelfAC power: Internal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximumDimensions: 19 x 12 x 3.5 in (482 x 305 x 89mm)Weight: 22lbs. (10kg)