Avalon VT-737SP话放

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the avalon vt-737sp features a combination of tube pre-amplifiers, opto-compressor, sweep equalizer, output level and vu metering in a 2u space.

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 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-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 discrete, class a, high-current, balanced and dc coupled low noise output amplifier.

avalon vt-737sp 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.