Sirsalliyan Small Air Compressor

Compressor Vacuum

vacuum dryer

This invention relates to a vacuum dryer, more particularly to a vacuum dryer which is made compact and can quickly dry objects, such as grain, industrial raw materials and thrash.

BACKGROUND OF THE INVENTION

FIG. 1 is a schematic drawing of one example of a conventional vacuum dryer including an upper chamber 21 and a lower chamber 31 made to communicate with each other. A thermal cycle is formed through the upper chamber 21 and lower chamber 31 using a compressor 24, a condenser 25, an expansion valve 26 and an evaporator 27. A vacuum pump 22 is connected to one side of the upper chamber 21 through a discharge pipe 23.

The evaporator 27 is positioned within the upper chamber 21, while the condenser 25 is positioned within the lower chamber 31. The compressor 24 and the expansion valve 26 are located outside of the two chambers 21 and 31.

With such a construction, an object to be dried is introduced into the lower chamber 31 through an opening therein (not shown) and power is turned on. The thermal cycle begins as the vacuum pump 22 is activated. Once the vacuum pump 22 as connected to the discharge pipe 23 has been activated, air is discharged from inside of the combination of the upper chamber 21 and lower chamber 31 through the discharge pipe 23. A vacuum is maintained in the upper chamber 21 and the lower chamber 31 during the drying process. In this condition, the compressor 24 within the thermal cycle continuously circulates a refrigerant or other comparable fluid through the system including the condenser 25, the expansion valve 26 and the evaporator 27.

When the thermal cycle is created, the condenser 25 discharges heat into the lower chamber 31, and the evaporator 27 absorbs heat from the upper chamber 21. Accordingly, due to the heat exchange within the two chambers, the temperature within the lower chamber 21 can be maintained within a range of about 40° C. to 50° C., and the temperature within the upper chamber 21 can be maintained at approximately 5° C. Therefore, moisture can be evaporated from objects disposed in the lower chamber 31, condensed in the upper chamber 21, and discharged to outside the dryer by the vacuum pump 22.

Conventional vacuum dryers, as described above, have certain disadvantages. First, the conventional vacuum dryer has a complicated construction. Second, it is expensive to operate due to the cost of creating the thermal cycle for heat exchange in the chambers and the cost of transporting the dried material from the lower chamber because the volume of the dried material cannot be reduced significantly.

SUMMARY OF THE INVENTION

A principal object of the present invention is the production of a vacuum dryer, and more particularly, a compact vacuum dryer that can quickly dry objects, such as grain, industrial raw material and thrash.

This and other objects and features of this invention can be achieved by providing a vacuum dryer including the combination of an upper chamber and a lower chamber drying objects. A vacuum pump is connected to the upper chamber for drawing in air. A direct heating means is provided at one side of the combination of the upper and lower chambers for directly heating the drying objects. A dielectric heating means for indirectly heating drying objects is also provided. A moisture removing means is positioned between the upper chamber and the vacuum pump for preventing the vacuum pump from drawing in moisture from the drying objects.

Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

About the Author

This invention relates to a vacuum dryer, more particularly to a vacuum dryer which is made compact and can quickly dry objects, such as grain, industrial raw materials and thrash.

Avalon VT-747SP Stereo Compressor EQ $2229.49 The Avalon VT-747SP Stereo Compressor"EQ lets you choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications. This Avalon Compressor combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies. All in just 2 rackspaces.Stereo Class A 6-band discrete passive program EQ TSP twin signal path, vacuum tube bypass Low noise -92dB Fully balanced Class A input and DC coupled outputs Stereo dynamic 60dB high resolution output meters High-quality analog VU meter for gain reduction High headroom +36dB input before overload Spectral side-chain monitor for pre listen EQ pre-post selection for opto-compressor Sealed silver relays for all signal routing Internal discrete regulated power supplies Military spec vacuum tubes for long life and low noise

Avalon Vt-747Sp Stereo Compressor Eq $2449.99 The Avalon VT-747SP Stereo Compressor"EQ lets you choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications. This Avalon Compressor combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies. All in just 2 rackspaces.Stereo Class A 6-band discrete passive program EQ TSP twin signal path, vacuum tube bypass Low noise -92dB Fully balanced Class A input and DC coupled outputs Stereo dynamic 60dB high resolution output meters High-quality analog VU meter for gain reduction High headroom +36dB input before overload Spectral side-chain monitor for pre listen EQ pre-post selection for opto-compressor Sealed silver relays for all signal routing Internal discrete regulated power supplies Military spec vacuum tubes for long life and low noise

Aphex 661 Expressor Compressor/Limiter $681.59 The Aphex 661 Expressor Compressor/Limiter is a totally new type of compressor incorporating vacuum tube technology with the latest innovations in audio compression. It features Tubessence, Easyrider, and High Frequency Expander patented circuits for compression that is both warm and full-sounding without the high heat, bulk, short life, fragility, and sonic variability found in traditional tube designs. You also get automatic attack and release times that eliminate any guesswork in your settings.Tubessence, Easyrider, and High Frequency Expander patented circuits Compression that is both warm and full-sounding Automatic attack and release times eliminates guesswork High Frequency Expander circuit adds life and air to your comopressed signals without fear of background noise pumping Spectral Phase Refractor restores clarity and punch to your tracks

Electro-Harmonix NY-2A Stereo Tube Compressor $2692.5 With the NY-2A Stereo Tube Compressor Electro-Harmonix uses Lundahl transformers, 8 super linear, low noise gold pin vacuum tubes and military grade components to create one of the finest professional audio compressors ever built. The rackmount stereo tube optical compressor has 3 opto-couplers for 3 distinct modes of compression for each channel (EL, LED and Incandescent Lamp). The NY-2A is 600 ohm defeatable, and has XLR In and Out with linkable operation. The Electro-Harmonix NY-2A Stereo Tube Compressor also has standard VU metering and rapid ballistics magic eye metering.

Avalon VT-747SP Stereo Compressor EQ Regular 886830334115 $2082.49 The Avalon VT-747SP Stereo Compressor"EQ lets you choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications. This Avalon Compressor combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies. All in just 2 rackspaces.Stereo Class A 6-band discrete passive program EQ TSP twin signal path, vacuum tube bypass Low noise -92dB Fully balanced Class A input and DC coupled outputs Stereo dynamic 60dB high resolution output meters High-quality analog VU meter for gain reduction High headroom +36dB input before overload Spectral side-chain monitor for pre listen EQ pre-post selection for opto-compressor Sealed silver relays for all signal routing Internal discrete regulated power supplies Military spec vacuum tubes for long life and low noise

Used Avalon Vt-747Sp Stereo Compressor Eq $2229.49 The Avalon VT-747SP Stereo Compressor"EQ lets you choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications. This Avalon Compressor combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies. All in just 2 rackspaces.Stereo Class A 6-band discrete passive program EQ TSP twin signal path, vacuum tube bypass Low noise -92dB Fully balanced Class A input and DC coupled outputs Stereo dynamic 60dB high resolution output meters High-quality analog VU meter for gain reduction High headroom +36dB input before overload Spectral side-chain monitor for pre listen EQ pre-post selection for opto-compressor Sealed silver relays for all signal routing Internal discrete regulated power supplies Military spec vacuum tubes for long life and low noise

D.W. Fearn Vt-7 Stereo Compressor $4800 The D.W. Fearn VT-7 Stereo Compressor has an all Class-A vacuum tube audio path, like all Fearn audio products. The gain reduction elements utilize circuitry that duplicates the sound and characteristics of the finest classic vacuum tube compressors, without depending on tubes that are no longer manufactured. The control circuitry is modern solid-state analog. The two channels may be used independently or linked together for stereo. A built in sidechain high-pass filter may be selected to reduce the compression on bass-heavy material. Controls (each channel): Threshold Gain Attack Release Harder/Softer Separate/Link/Link HPF The VU meters may be switched between indicating gain reduction or output level. The VT-7 Compressor has a highly transparent sound, although it can be used more aggressively when needed. Artifacts of the compression process are substantially lower than in most other compressors. The two channels may be used independently, or linked for stereo. In addition, a third position on the Link switch inserts a high-pass filter (HPF) in the sidechain to reduce the gain-reduction sensitivity of the VT-7 to low frequencies. This is a gentle roll-off, nominally at 100Hz. This allows a bass-heavy mix to have a better frequency balance, and prevents heavy low-frequency audio from modulating the audio level. The VT-7 is equally adept in tracking as well as a bus compressor. Even jazz and classical tracks can be sent through the VT-7 for some mild gain control without obvious effect other than a significant improvement in the overall sound of the mix. Design Philosophy Like all D.W. Fearn products, the VT-7 stereo compressor is a no-compromise design. From the quarter-inch thick front panel painted with the finest polyurethane finishes to the choice of all components and controls, the VT-7 is built to look as great as it sounds. Fearn build products that last, so they use parts with superior durability and longevity. Fearn products are hand-built by craftsman, one at a time, in the USA. Important Note: Having many tubes, the VT-7 generates a considerable amount of heat. We highly recommend using D.W. Fearn Vented Rack Panels (#180296) above and below the unit for proper cooling. History of the VT-7 Compression Amplifier Compression (or limiting) is sometimes seen as a necessary evil in the recording process. Often it is used to compensate for less than optimum performance or recording technique. However, when used appropriately, there is no question that good-sounding compression can add loudness, power, and improved impact to a recording. Over many years of recording, I have had the opportunity to use and sometimes own some of the best compressors in the world. For the D.W. Fearn line of products, a compressor was obviously important. I began the search for the ultimate compressor design in 1995 and it wasn't until 2004 that I developed the sound I was looking for. There are several ways to achieve compression, and all ha

2-in-1 Air Compressor + Vacuum Cleaner Set (DC 12V) $46.9 - Model: JF-388- Color: White + Blue- Voltage: DC 12V- Maximum pressure: 300 PSI- Comes with 1 pressure gauge, 1 brush, 1 needle, 1 tube, length of wire is 250 cm

Electro-Harmonix Ny-2A Stereo Tube Compressor $2692.5 With the NY-2A Stereo Tube Compressor Electro-Harmonix uses Lundahl transformers, 8 super linear, low noise gold pin vacuum tubes and military grade components to create one of the finest professional audio compressors ever built. The rackmount stereo tube optical compressor has 3 opto-couplers for 3 distinct modes of compression for each channel (EL, LED and Incandescent Lamp). The NY-2A is 600 ohm defeatable, and has XLR In and Out with linkable operation. The Electro-Harmonix NY-2A Stereo Tube Compressor also has standard VU metering and rapid ballistics magic eye metering.True bypass for each channel using mechanical relaysSwedish Luhndal transformers at both the input and output of both channelsSwitchable electroluminescent, LED or incandescent lamps for distinct and unique compressionsDual mono or stereo with the ability to assign different compressions on each channelLink mode to bridge channels 1 and 2Each channel fully independent when Link mode set to offInput and output gain controlsHigh quality detented potentiometers to ease recall of settingsSwitchable squash mode for additional high frequency compression in EL modeSwitchable attack mode for slower attack in incandescent modeSwitchable 20 dB pad at the input of each channel8 professional, low-noise Electro-Harmonix vacuum tubesFast response magic eye tube meters

D.W. Fearn VT-7 Stereo Compressor $4800 The D.W. Fearn VT-7 Stereo Compressor has an all Class-A vacuum tube audio path, like all Fearn audio products. The gain reduction elements utilize circuitry that duplicates the sound and characteristics of the finest classic vacuum tube compressors, without depending on tubes that are no longer manufactured. The control circuitry is modern solid-state analog. The two channels may be used independently or linked together for stereo. A built in sidechain high-pass filter may be selected to reduce the compression on bass-heavy material. Controls (each channel): Threshold Gain Attack Release Harder/Softer Separate/Link/Link HPF The VU meters may be switched between indicating gain reduction or output level. The VT-7 Compressor has a highly transparent sound, although it can be used more aggressively when needed. Artifacts of the compression process are substantially lower than in most other compressors. The two channels may be used independently, or linked for stereo. In addition, a third position on the Link switch inserts a high-pass filter (HPF) in the sidechain to reduce the gain-reduction sensitivity of the VT-7 to low frequencies. This is a gentle roll-off, nominally at 100Hz. This allows a bass-heavy mix to have a better frequency balance, and prevents heavy low-frequency audio from modulating the audio level. The VT-7 is equally adept in tracking as well as a bus compressor. Even jazz and classical tracks can be sent through the VT-7 for some mild gain control without obvious effect other than a significant improvement in the overall sound of the mix. Design Philosophy Like all D.W. Fearn products, the VT-7 stereo compressor is a no-compromise design. From the quarter-inch thick front panel painted with the finest polyurethane finishes to the choice of all components and controls, the VT-7 is built to look as great as it sounds. Fearn build products that last, so they use parts with superior durability and longevity. Fearn products are hand-built by craftsman, one at a time, in the USA. Important Note: Having many tubes, the VT-7 generates a considerable amount of heat. We highly recommend using D.W. Fearn Vented Rack Panels (#180296) above and below the unit for proper cooling. History of the VT-7 Compression Amplifier Compression (or limiting) is sometimes seen as a necessary evil in the recording process. Often it is used to compensate for less than optimum performance or recording technique. However, when used appropriately, there is no question that good-sounding compression can add loudness, power, and improved impact to a recording. Over many years of recording, I have had the opportunity to use and sometimes own some of the best compressors in the world. For the D.W. Fearn lin

Used Aphex 661 Expressor Compressor/Limiter $681.59 The Aphex 661 Expressor Compressor/Limiter is a totally new type of compressor incorporating vacuum tube technology with the latest innovations in audio compression. It features Tubessence, Easyrider, and High Frequency Expander patented circuits for compression that is both warm and full-sounding without the high heat, bulk, short life, fragility, and sonic variability found in traditional tube designs. You also get automatic attack and release times that eliminate any guesswork in your settings.Tubessence, Easyrider, and High Frequency Expander patented circuits Compression that is both warm and full-sounding Automatic attack and release times eliminates guesswork High Frequency Expander circuit adds life and air to your comopressed signals without fear of background noise pumping Spectral Phase Refractor restores clarity and punch to your tracks

Millennia TCL-2 Twincom Stereo Compressor / Limiter $3221.99 The Millennia TCL-2 Twincom is an ultratransparent, 2-channel opto-compressor/limiter. The Twincom delivers Class-A biased all-discrete J-FET solid-state operation or Class-A biased all-triode vacuum tube operation at the touch of a switch.The TCL-2 Twincom stereo compressor/limiter with Twin Topology is Millennia's innovative new merging of vacuum tube and solid state circuit topologies. A front panel switch selects between a complete vacuum tube audio path or a fully discrete solid-state audio path - in the same chassis. Both circuit topologies are entirely transformerless, high voltage, and minimalist.The Twincom has only one active stage in the audio signal path for greater sonic integrity and heightened musical reality. This stage is optimized as an input buffer, dynamics amplifier, and output driver. Greatly increased musical clarity is achieved as precious audio signals are spared from successively colored amplifier stages.The Twincom is also designed as an entirely balanced circuit. The balanced input signal remains balanced from input to output, avoiding the need for audio transformers or additional amplifiers in the signal path.Why transformerless? Transformers add coloration to audio signals; coloration which is not conducive to sonic purity. Via innovative design techniques, the Twincom avoids audio transformers entirely, allowing the remarkable musicality of Class-A triode dynamics without the unavoidable sonic artifacts common to signal path transformers.The solid-state aspect of Twin Topology consists of 100% Class-A all discrete J-FET (field effect transistor) amplifiers. The vacuum tube aspect of Twin Topology employs 300 volt, 100% Class A, hand-tested and selected triode vacuum tubes. To use the vacuum tube amplifier, simply press a front panel switch. To use the solid-state amplifier, press the switch again. Both topologies are designed to deliver musical optimization with individual character.The Twincom offers illuminated push-button switches, machined aluminum knobs, extruded and radiused face plate (nearly 3/8" thick), and a stylish "TT" logo deeply engraved into every panel. The Twincom employs exquisite high voltage amplifiers free of transformer coupling, carefully designed around the finest grades of passive components (Vishay pots, Roederstein resistors, Wima and Electrocube capacitors, Neglex OFC audio cabling, gold tube connectors and relay contacts, silver Teflon power wiring, large Sifam true audio level meters, etc.).

Millennia Tcl-2 Twincom Stereo Compressor / Limiter $3230.99 The Millennia TCL-2 Twincom is an ultratransparent, 2-channel opto-compressor/limiter. The Twincom delivers Class-A biased all-discrete J-FET solid-state operation or Class-A biased all-triode vacuum tube operation at the touch of a switch.The TCL-2 Twincom stereo compressor/limiter with Twin Topology is Millennia's innovative new merging of vacuum tube and solid state circuit topologies. A front panel switch selects between a complete vacuum tube audio path or a fully discrete solid-state audio path - in the same chassis. Both circuit topologies are entirely transformerless, high voltage, and minimalist.The Twincom has only one active stage in the audio signal path for greater sonic integrity and heightened musical reality. This stage is optimized as an input buffer, dynamics amplifier, and output driver. Greatly increased musical clarity is achieved as precious audio signals are spared from successively colored amplifier stages.The Twincom is also designed as an entirely balanced circuit. The balanced input signal remains balanced from input to output, avoiding the need for audio transformers or additional amplifiers in the signal path.Why transformerless? Transformers add coloration to audio signals; coloration which is not conducive to sonic purity. Via innovative design techniques, the Twincom avoids audio transformers entirely, allowing the remarkable musicality of Class-A triode dynamics without the unavoidable sonic artifacts common to signal path transformers.The solid-state aspect of Twin Topology consists of 100% Class-A all discrete J-FET (field effect transistor) amplifiers. The vacuum tube aspect of Twin Topology employs 300 volt, 100% Class A, hand-tested and selected triode vacuum tubes. To use the vacuum tube amplifier, simply press a front panel switch. To use the solid-state amplifier, press the switch again. Both topologies are designed to deliver musical optimization with individual character.The Twincom offers illuminated push-button switches, machined aluminum knobs, extruded and radiused face plate (nearly 3/8" thick), and a stylish "TT" logo deeply engraved into every panel. The Twincom employs exquisite high voltage amplifiers free of transformer coupling, carefully designed around the finest grades of passive components (Vishay pots, Roederstein resistors, Wima and Electrocube capacitors, Neglex OFC audio cabling, gold tube connectors and relay contacts, silver Teflon power wiring, large Sifam true audio level meters, etc.).Two signal paths in one chassis--vaccum tube and discrete solid stateEntirely Class-A Twin Topology designUltrapremium components throughoutGold relays, connectors, and tube socketsSilver/Teflon power wiring, OFC audio wiring

Vacuum $92.4 Vacuum. Space, Outer space, Human adaptation to spaceflight, Vacuum pump, Outgassing, Pressure measurement, Manifold vacuum, Ultra high vacuum, Vacuum deposition, Vacuum energy, Vacuum flange, Vacuum tube, Vacuum packing, Vacuum brake Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 110 Publication Date: 2009/10/11 Language: English Dimensions: 5.98 x 9.01 x 0.26 inches

Used Avalon Vt-747Sp Stereo Compressor Eq Regular 886830334115 $2082.49 The Avalon VT-747SP Stereo Compressor"EQ lets you choose between tube tone and the classic Class A discrete transistor sound. Ideal for high-performance DAW input signal conditioning, stereo bus compression-EQ, stereo keyboards, and analog mastering applications. This Avalon Compressor combines a stereo tube-discrete Class A opto-compressor with musical 6-band program EQ, L-R output level and gain reduction metering, and internal regulated power supplies. All in just 2 rackspaces.Stereo Class A 6-band discrete passive program EQ TSP twin signal path, vacuum tube bypass Low noise -92dB Fully balanced Class A input and DC coupled outputs Stereo dynamic 60dB high resolution output meters High-quality analog VU meter for gain reduction High headroom +36dB input before overload Spectral side-chain monitor for pre listen EQ pre-post selection for opto-compressor Sealed silver relays for all signal routing Internal discrete regulated power supplies Military spec vacuum tubes for long life and low noise

Drawmer 1960 Mic Pre/Tube Compressor 889406476844 $1125 Combining eight active tube stages and the low noise and reliability of solid state electronics, the Drawmer 1960 provides the ultimate direct interface between the sound source and the recording medium. The Drawmer 1960 is a two channel unit with each channel comprised of a completely natural sounding "soft knee" vacuum tube compressor and an extremely low noise microphone pre-amplifier with switchable 48 volt phantom power. A further auxiliary instrument pre-amp with EQ is also provided. This powerful combination of the classic valve circuit, offering unsurpassed tonality, and the low noise balanced microphone input with up to 60dB of gain has allowed engineers throughout the world to exploit the full potential of high performance condenser microphones. An example of this would be the direct to digital stereo recording of live classical music without the necessity of a mixing console. The Compressor: Because the compressor is a soft knee type, it requires few controls. Strictly speaking, a soft knee design does not have a rigidly defined threshold but the title 'Threshold' has been retained for the "amount of compression" control for the sake of familiarity. The Threshold range is continuously variable between infinity and -24dB, the theory being that signals below the threshold are essentially unprocessed and the signals exceeding this threshold are subjected to increasing amounts of gain reduction dependent on by how much they exceed the threshold._The attack and release times are switchable rather than being continuously variable and this method of operation falls into line with that of its all valve predecessors. Attack simply offers a-choice of slow, medium and fast whilst release has six settings. Positions one to four have fixed release times whilst positions five and six are two different programme dependent release time modes making the unit ideally suited to programme material with complex dynamics such as complete stereo mixes and vocals. Interestingly, the attack times are further modified by the choice of release setting so the range of choices are wider than it might first appear. Because compression is a form of controlled gain reduction, a stage of make-up amplification follows the compressor section giving a range of +20dB. The VU meters may be switched to monitor either the amount of gain reduction taking place or the output signal level and the two channels may be used either independently or as a stereo pair, depending on the setting of the stereo link switch. The side chain access points may be used to patch in equalisers to enable the compressor to act as a de-esser. As with other Drawmer products, the by-pass switch offers a choice of Normal. By-pass and Side Chain Listen modes so that if you have patched in any additional side chain processing, you can easily monitor what effect it is having. In addition to the balanced microphone and line inputs on the rear of the unit an auxiliary input on the front panel gives dir

Drawmer 1960 Mic Pre/Tube Compressor $2250 Combining eight active tube stages and the low noise and reliability of solid state electronics, the Drawmer 1960 provides the ultimate direct interface between the sound source and the recording medium. The Drawmer 1960 is a two channel unit with each channel comprised of a completely natural sounding "soft knee" vacuum tube compressor and an extremely low noise microphone pre-amplifier with switchable 48 volt phantom power. A further auxiliary instrument pre-amp with EQ is also provided. This powerful combination of the classic valve circuit, offering unsurpassed tonality, and the low noise balanced microphone input with up to 60dB of gain has allowed engineers throughout the world to exploit the full potential of high performance condenser microphones. An example of this would be the direct to digital stereo recording of live classical music without the necessity of a mixing console. The Compressor: Because the compressor is a soft knee type, it requires few controls. Strictly speaking, a soft knee design does not have a rigidly defined threshold but the title 'Threshold' has been retained for the "amount of compression" control for the sake of familiarity. The Threshold range is continuously variable between infinity and -24dB, the theory being that signals below the threshold are essentially unprocessed and the signals exceeding this threshold are subjected to increasing amounts of gain reduction dependent on by how much they exceed the threshold._The attack and release times are switchable rather than being continuously variable and this method of operation falls into line with that of its all valve predecessors. Attack simply offers a-choice of slow, medium and fast whilst release has six settings. Positions one to four have fixed release times whilst positions five and six are two different programme dependent release time modes making the unit ideally suited to programme material with complex dynamics such as complete stereo mixes and vocals. Interestingly, the attack times are further modified by the choice of release setting so the range of choices are wider than it might first appear. Because compression is a form of controlled gain reduction, a stage of make-up amplification follows the compressor section giving a range of +20dB. The VU meters may be switched to monitor either the amount of gain reduction taking place or the output signal level and the two channels may be used either independently or as a stereo pair, depending on the setting of the stereo link switch. The side chain access points may be used to patch in equalisers to enable the compressor to act as a de-esser. As with other Drawmer products, the by-pass switch offers a choice of Normal. By-pass and Side Chain Listen modes so that if you have patched in any additional side chain processing, you can easily monitor what effect it is having. In addition to the balanced microphone and line inputs on the rear of the unit an auxiliary input on the front panel gives dir

Chameleon Labs 7802 Stereo Opto Tube Compressor $769 This level of sonic integrity has been reserved for the kilo-buck price range, until now. In the spirit of classic OPTO compressors, the 7802 Stereo Opto Tube Compressor is a unique hybrid design of vacuum tube and transformer circuitry combined with modern, high performance components. The 7802 compressor offers smooth, open, full bandwidth compression, while imparting a pleasant, subtle glow to your tracks. The silky attack is achieved via electro-optical circuitry, followed by a robust tube makeup gain stage. Final perfection is presented via the transformer balanced outputs. Read this comment from Martin Feveyear - Producer/Mixer, Jupiter Studios, Seattle (Brandi Carlile, REM, Queens of the Stone Age, Blue Scholars, The Saturday Knights, Duff McKagan's Loaded, Mark Lanegan): "Please please please don't make me give this thing back..... It can be a soft and slow lover just like you want your classic Opto to be, or it can be a quick, dirty and grabby little mistress that colours up the party. The only Opto Compressor that I would strap across a mix." What Makes Chameleon Labs Different? Chameleon Labs is a new type of company, focused on delivering performance and value at a price previously thought impossible. How do they do it? By reinventing how global manufacturing is approached. Chameleon Labs engineers are not inexperienced kids in a garage, buying products that are designed and built in China. Chameleon Labs is comprised of audio professionals with many decades of experience in high-end pro audio gear. From its inception seven years ago, they pioneered the idea of "blended technology", using top-notch parts from the US, UK, and Europe combined with low-cost metalwork and assembly from China. This combination enables a superior performance level at a low price point. Every Chameleon Labs product is first created and engineered here in the U.S. The goal is to achieve a specific sound through tedious testing in major U.S. recording studios and listening to numerous tracks and/or mixes with a very specific sonic target in mind. A new design must impress the best and brightest of our evaluation group before it ever reaches the factory floor.Two channel opto-isolator/tube-based compression Stereo linkable channels Vactrol optical electronics Hand selected 12AX7 tubes Five position attack/release selector Two position ratio switch (2:1 and 4:1) HPF switch for compressor side chain (6dB/octave roll off, 3dB down @ 90Hz) Drive control to adjust the amount of tube overdrive Output control to set the overall output level LED metering of input and clip levels VU metering of compression XLR balanced inputs XLR transformer balanced outputs Internal power supply One year warranty

ART Pro VLA II Tube Compressor $299 The Pro VLA by ART is a tube driven Vactrol-based Compressor/Leveling amplifier designed to excel in any professional audio application, including tracking, mixing, mastering, live sound or broadcast situations. By using an opto-electronic design, (as opposed to a more typical VCA driven level detection circuit) the Pro VLA II allows more compression to be added to an audio source with a more natural, musical sounding output and virtually transparent dynamic leveling. This VCA-less design coupled with a 12AT7 vacuum tube in the gain stage makes the Pro VLA II tube compressor the ideal dynamic control device for critical studio and live sound applications.These are the differences between the Pro VLA and the Pro VLA II1. Enhanced Link modeIn link mode, CH1 output control acts as a master output level and CH2 becomes a Balance control. This optimizes the Pro VLA II for use as a mastering processor.2. Active balanced outputs. The old VLA has balanced outputs that have 6dB more gain than when using them in the unbalanced mode. This shows up as an error when using the VU meter to compare the input and output level.3. LED output meter. a. Always monitors the output level allowing the user to view Both input and output levels at the same time.b. LED meter indicates both average level plus Peak hold.4. Attack and Release knobs vs. switches. The Old VLA compressor has switches that allow the user to adjust the attack time between "Fast" (~1mSec) and "Normal" (~10mSec). The release switch can be set to "normal" (200mSec) and "Auto" (program dependant, but rather long an average). a. Attack time as ranges from .25mSec to 50mSecb. Release time ranges from 0.15Sec to 3Sec. (This is program dependant at shorter release rates).c. Improved detector that lowers low frequency distortion at fast release rates.5. Improved packagea. Rounded front panel machined to countersink all knobs and level meters.b. Re-enforced ears.c. Led lit switch caps.d. Heavier chassis and cover ruggedized for longer life on the road.6. Lower noise. a. +4dBu/-10dBv mode switch optimizes the unit for Pro OR consumer operating system levels.b. Toroidal transformer reduces mechanical and electrical hum.c. Tweaked Tube circuit for better dynamic range.d. Increased transformer shielding.7. Increased ranges on Threshold and Output gain. This allows the user a wider range of operation. a. Old threshold -20 to +15, New Threshold range -30dB to +20dB.b. Old Output gain max +10dB, New output Gain +20dB8. LED lit VU meters. No more dark meters due to blown out bulbs.9. All of the pots have detents. a. Imparts a more professional feel.b. Makes settings more repeatable.

Art Pro Vla Ii Tube Compressor $299 The Pro VLA by ART is a tube driven Vactrol-based Compressor/Leveling amplifier designed to excel in any professional audio application, including tracking, mixing, mastering, live sound or broadcast situations. By using an opto-electronic design, (as opposed to a more typical VCA driven level detection circuit) the Pro VLA II allows more compression to be added to an audio source with a more natural, musical sounding output and virtually transparent dynamic leveling. This VCA-less design coupled with a 12AT7 vacuum tube in the gain stage makes the Pro VLA II tube compressor the ideal dynamic control device for critical studio and live sound applications.These are the differences between the Pro VLA and the Pro VLA II:1. Enhanced Link modeIn link mode, CH1 output control acts as a master output level and CH2 becomes a Balance control. This optimizes the Pro VLA II for use as a mastering processor.2. Active balanced outputs. The old VLA has balanced outputs that have 6dB more gain than when using them in the unbalanced mode. This shows up as an error when using the VU meter to compare the input and output level.3. LED output meter. a. Always monitors the output level allowing the user to view Both input and output levels at the same time.b. LED meter indicates both average level plus Peak hold.4. Attack and Release knobs vs. switches. The Old VLA compressor has switches that allow the user to adjust the attack time between "Fast" (~1mSec) and "Normal" (~10mSec). The release switch can be set to "normal" (200mSec) and "Auto" (program dependant, but rather long an average). a. Attack time as ranges from .25mSec to 50mSecb. Release time ranges from 0.15Sec to 3Sec. (This is program dependant at shorter release rates).c. Improved detector that lowers low frequency distortion at fast release rates.5. Improved packagea. Rounded front panel machined to countersink all knobs and level meters.b. Re-enforced ears.c. Led lit switch caps.d. Heavier chassis and cover ruggedized for longer life on the road.6. Lower noise. a. +4dBu/-10dBv mode switch optimizes the unit for Pro OR consumer operating system levels.b. Toroidal transformer reduces mechanical and electrical hum.c. Tweaked Tube circuit for better dynamic range.d. Increased transformer shielding.7. Increased ranges on Threshold and Output gain. This allows the user a wider range of operation. a. Old threshold = -20 to +15, New Threshold range = -30dB to +20dB.b. Old Output gain max = +10dB, New output Gain = +20dB8. LED lit VU meters. No more dark meters due to blown out bulbs.9. All of the pots have detents. a. Imparts a more professional feel.b. Makes settings more repeatable.Vactrol Opto-compression design (No VCA)Mastering-quality audio signal path with tube gain stageEnhanced link mode Variable threshold, ratio and output controlsLED backlit VU input/output level meteringLED metering indicates both average level and peak holdAccurate ten segment LED gain reduction metering+4dBu/-10dBV mode swit

BBE BenchPress Vintage Compressor $149.99 BBE BenchPress Vintage Compressor

Joemeek MC2 Stereo Compressor $279.99 Joemeek MC2 Stereo Compressor

dbx 160A Compressor/Limiter $429.95 dbx 160A Compressor/Limiter

Daking FET Compressor/Limiter $1445 Daking FET Compressor/Limiter

dbx 266xs Compressor/Gate $136.45 dbx 266xs Compressor/Gate

Air Compressor Kit $299.99 Air Compressor Kit;

Daking Fet Compressor/Limiter $1314.95 Daking FET Compressor/Limiter

Dbx 160A Compressor/Limiter $429.95 dbx 160A Compressor/Limiter

Bbe Benchpress Vintage Compressor $149.99 BBE BenchPress Vintage Compressor

Dbx 266Xs Compressor/Gate $136.45 dbx 266xs Compressor/Gate