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Description
Avalon VT-737SP Microphone Preamplifier (Black)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 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 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
Specifications
- Circuit topologyFour dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A
- Gain RangeMicrophone: Transformer balanced 850/2500 ohm, 0dB to +58dBInstrument: Unbalanced 1 meg ohm, 0dB to+30dBLine: Balanced Class A 20k ohms, -27dB to 28dB
- Maximum input level and connector typesMicrophone: 26dB@25Hz, +30dB@1kHz balanced XLRInstrument: +30dB unbalanced front panel jack socketLine: +36dB balanced XLR
- Line+36dB balanced XLR
- Maximum output level+30dB balanced 600 ohms, DC coupled, discrete Class A
- Output type and gainTRS connector, output trim gain -45dB to 20dB (XLR connector by special request)
- Noise 20kHz unweighted-92dB
- Noise microphone EIN-116dB, 22Hz to 22kHz unweighted
- Distortion THD, IMD0.5%
- Frequency response -/2.5dB10Hz to 120kHz input filter included
- Frequency response -3dB1Hz to 200kHz line in-out
- VU meter and gain reductionHigh quality illuminated OVU =+4dB and gain reduction to -20dB
- High cut filterVariable 6dB per octave 30Hz to 140Hz
- Compressor typeOptical passive attenuator incorporating twin vacuum tubes and stereo link
- Threshold - RatioThreshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1
- Attack - ReleaseAttack variable 2mS to 200mS, release variable 100mS to 5 seconds
- Equalizer typeDiscrete Class A, variable active and switched passive design
- Frequency bands (4)Treble - switched 10kHz, 15kHz, 20kHz, 32kHz, +/- 20dB rangeShelf High mid - variable 200Hz to 2k8Hz and 2kHz to 28kHz, +/- 16dB rangeHi-lo Q Low mid - variable 30Hz to 450Hz and 300Hz to 4k5Hz, +/- 16dB rangeHi-lo Q Bass - switched 15Hz, 30Hz, 60Hz, 150Hz, +/- 24dB range, shelf
- AC powerInternal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximum
- Dimensions19 x 12 x 3.5 in (482 x 305 x 89mm)
- Weight22lbs (10kg)
- Dimensions-shipping carton21 x 18 x 8 in (533 x 457 x 203mm)
- Weight-packed26lbs (11.8kg)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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