Tube Mic Pre
Feeds
Introduction:
The concern for the patient’s health has revolutionized catering services at the hospital(s). It is in response to research conducted over the past decades to improve patient’s health at a faster pace by supplementing nutritious food along with the critical care. It has become imperative part of most of the hospitals to provide the patient with the required nutrition feed that support in rapid recovery of the patient (Concern at nutrition in hospitals).
The hospitals are following the diet charts based on ongoing research and studies that correlate diseases with nutrient supplement along with the therapeutics. It is evident that besides balanced food that is given to the patient some other nutrient supplements facilitate in recovery and reduce the health related troubles that become devastating if deficiency is related with the nutrients required for the well being.
Patients are getting variety and choice of nutrition feed because of the commercial availability of many products in the market. Many companies are coming up with a special protocol of feed and related illness. This enhances the awareness of patient about the kind of food essential to combat illness (Concern at nutrition in hospitals).
Nutrition supplements are licensed products and can be provided as the sole source of nutrition. They may be prescribed on medical grounds for diverse ailments. Depending on the severity and class of sickness, the nutrition supplements can be taken.
Hospitals play lead role in making the patient aware of the consequences if the nutrition is not provided in the desired quantity. Hospital staff must help the patient psychologically, the advantages and disadvantages of the feed type he has been introduced to. This not only prepares the patient mentally but patient also co-operates with the hospital staff.
Keeping this in mind the present study is conducted to build an understanding towards the nutritional support products, their advantages and problems and the available products that patient can utilize for better and sooner recovery.
Basically three types of feeds are given for diverse ailments these are:
Sip feeds,
Enteral (tube) feeds and
TPN feeds.
Sip Feeds
Various policies are defined to prescribe Sip feeds or Oral Nutrition Supplements for Patients with poor nutritional status especially those having:
? Disease related malnutrition
e.g. Reduced appetite or experience difficulty in swallowing, in cancer of throat or gut.
? Short-bowel syndrome (SBS)
? Intractable malapsorption
? Pre-operative preparation of undernourished patients
? Proven inflammatory bowel disease
? Following total gastrectomy
? Dysphagia
? Bowel Fistulas
? CAP Dialysis (Nutrition support in adults)
Importance of Sip feed: Help the patient to gain weight or avoid loss of weight.
Help the patient to surmount weakness of tiredness
Help the patient to take in adequate liquid.
Help the patient to alleviate the pressure to eat
Help the patient to drink enough when dietary supplements cannot.
(Nutrition support in adults)
Before prescribing Sip feed it is essential to assess nutritional status, BMI calculation and weight loss by using simple nutritional risk scoring system
When prescribing sip feeds
* Do try equipped standard food
(by adding milk, butter, cheese or cream)
as first line therapy (4weeks before stipulating sip feeds).
* Ensure that all patients be given suitable dietary advice by a state-registered dietitian
or suitable trained member of the primary health care team.
* No long term use without regular monitoring and assessment
* It should not exceed 500-600kcals daily unless under the care of a dietitian.
* Ensure that supplements are not taken at meal times / after meals e.g. as a bedtime drink
to avoid reduction in food intake.
* It should not be given as the sole source of nutrition except in consultation with dietitian.
* It should not be prescribed for more than 4-6 weeks
* it should not be prescribed as repeat medication except in exceptional cases
* refer to dietician in case of no improvement
* The supplements must be chilled before use.
Monitoring
· Regular weight and BMI monitoring is important to identify the improvement(s).
Some patients may face problems of constipation when taking sip feed (some products
Contain fiber)
· Same taste and texture may become boring for the patient so commercially available mixed flavors /alternative products must be given.
· Milk based liquid feeds are nutritionally complete, when taken in sufficient quantity
Examples of commercially available sip feed-
Build-Up,
Fortimel
Fortisip.
Build-Up was reported to be the best-tolerated product of the three (Bolton et al, Comparison of three oral sip-feed supplements in patients with cancer), as it was taken for longer time and was stopped by some patients due to flavour related problems. They are the sip feeds mostly given to cancer patients in various hospitals in UK.
Other kind of sip feed includes the soups and porridges Sip feed are not only rich in vitamins, minerals, proteins and energy but also help in maintaining proper salt balance in the body.
Enteral (tube) Feeds
This type of feed includes nutritional fluid and is given into the gut through a tube going into the stomach or small intestine. It is given to the patient if the digestive system is working well, but due to illness or some difficulty a patient is not able to eat enough e.g. in cancer of head or neck. (Nutrition support in adults)
Methods of EN are used in the surgery of head, neck, stomach or gullet.
· Nasogastric (NG) feeding- where a thin tube is passed from the patients nasopharynx to the stomach. It is preferred when the feed is to be given for short time. E.g. patients undergone radiotherapy of mouth, throat or gullet as in this case swallowing becomes difficult due to swelling followed by radiotherapy. (Nutrition support in adults)
Problems associated with NG: Uncomfortable and distressing insertion, patient may feel embarrassing. The tube can e pulled out of the stomach if not fixed properly, occasional dislodging may occur, blocking of the tube. The process is follow slow flow of food else it may flow in the gullet so it is very unpleasant for the patient. (Nutrition support in adults)
· Percutaneous Endoscopic Gastrostomy (PEG) feeding- it is recommended if the digestive system is not in problem. Here a fistula is created through abdominal wall and feeding tube can be passed in the stomach and tube is held at its place with a stitch. (Nutrition support in adults)
· Radiologically-inserted Gastrostomy (RIG) where tube is passed in the stomach, through the skin of muscles of abdomen. The process is performed under x-ray conditions. (Nutrition support in adults)
Advantages of RIG/PEG: enables patient to get proper nutrition.
Problems are related with blockage. This may increase the chances of infection at the site of incision. A patient may develop temperature. This may give the feeling of some fluid oozing out of stomach. In PEG/RIG, tubes can remain in place for approximately two years and must be replaced if required. (Nutrition support in adults)
· Percutaneous endoscopic Jejunostomy (PEJ). It is very rarely used. In this method a feeding tube is passed into the top part of the small bowel i.e. jejunum which is present just below the stomach. (Nutrition support in adults)
Commercially available products:
Toptainer® Enteral Nutrition Container With Preattached Flexiflo® Quantum™ Pump Set by Ross, Division of Abbott Labs, Stackable design permits easy prefilling, storage, and transportation. 58-mm opening with screw cap makes filling easy (Enteral Nutrition Feeds).
MIC® Gastrostomy Tube by KIMBERLY CLARK-BALLARD, Features medical grade silicone construction, silicone internal retention balloon, SECUR-LOK® external retention ring, universal feeding poor (Enteral Nutrition Feeds).
Patrol™ Enteral Pump by Ross, Division of Abbott Labs, Unique Safe-T-Valve™ feature on feeding set prevents accidental product free-flow if set is improperly loaded or becomes dislodged from pump (Enteral Nutrition Feeds).
MIC-KEY® Low-Profile Gastrostomy Tube Kit by KIMBERLY CLARK-BALLARD, Features medical grade silicone construction, low-profile design, tapered distal tip, silicone internal retention balloon, distal tip recess (Enteral Nutrition Feeds).
They are all rich in protein, fat, electrolytes and vitamins in fixed proportions.
TPN/ PN Feeds
Parenteral nutrition (PN) is given through vein and is also called as Total Parenteral Nutrition (TPN) since it focuses on providing the patient with total nutritional support. PN provides nutrition directly to the blood stream whereas TPN indicates providing complete nutrition in the blood stream (Nutrition support in adults).
Advantages: It is given under rare condition when people are unable to have EN e.g. if the patient has undergone major surgery on the small bowel or have any kind of bowel obstruction, when the digestive system is not working and the process provides relaxation to it. PN is given through thin tube called as central line, inserted in the vein. This is also called a PICC (peripherally inserted central catheter) (Nutrition support in adults).
TPN is normally done when the other two feed processes cannot be performed e.g. when insertion of the EN tubes is difficult especially when a patient has undergone some kind of surgery of head, neck or stomach (Nutrition support in adults).
Problems with the TPN:
Infection may occur near the incision either inside the line or around the exit site. Swelling may occur; discharge may come out of the site. This may be followed by the course of antibiotics. In some patients thrombosis may occur and medicines are to be given to the patient (Nutrition support in adults).
Commercially Available TPN:
Intralipid contain soybean
LiposynII contains soybean and Safflower
LiposynIII contains soybean
Several lipid emulsions are commercially available what contain soybean, safflower, olive and fish oils. They are long chain lipids.
Some medium chain triglycerides (MCT) are also available (David, F).
Some are available as single oil entities, that encompass soybean and fish oils, while others are available in various oil mixtures like
Soybean-safflower
Soybean-MCT
Soybean-olive
Soybean-MCT-fish
Soybean-MCT-fish-olive oil emulsions (David, F)
These are rich source of energy, oils and their pharmacological actions are of great benefit to the patient. They are best when diseases are associated with the liver.
The initial formula is based on fluid volume, calories, protein and fat requirements and they are also supplemented with electrolytes, calories, proteins and fat requirements that give the correct assessment. They contain various amino acids in different combinations.
About the Author
Monika Nigam
Tube Preamp and DI. TUBE-TECH MP1A . Musical top quality.
Digital Audio Workstation DAW Compose, Record, Edit, Mix, Produce CD’s. Installed: Pro Tools/Cubase/Ableton. 24-bit/96kHz audio interface: dual mic/instrument preamps, analog I/O, S/PDF coaxial, MIDI I/O. Virtual instruments/equalizers/effects and 61 key MIDI Controller. $2,599.99
Audio Interface: The Fast Track Pro delivers you 2 front-panel mic/line inputs complete with phantom power for condenser microphones, inserts for outboard effects balanced and unbalanced analog outputs, S/PDIF digital I/O, MIDI I/O, and more. Fast Track Pro also features near-zero latency direct hardware monitoring and low-latency ASIO software monitoring, plus an A/B source switch and dual output…
Click here to learn more about Digital Audio Workstation DAW Compose, Record, Edit, Mix, Produce CD’s. Installed: Pro Tools/Cubase/Ableton. 24-bit/96kHz audio interface: dual mic/instrument preamps, analog I/O, S/PDF coaxial, MIDI I/O. Virtual instruments/equalizers/effects and 61 key MIDI Controller.
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Rode NT1A Anniversary Vocal Condenser Microphone Package $369.00
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ART Tube MP Studio Mic Preamp $29.99
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AKG PERCEPTION 120 Professional Studio Microphone for general purpose. $129.00
The Perception 120 is a 2/3-inch diaphragm true condenser microphone that offers solid build quality, outstanding performance, and excellent value. The low-mass diaphragm delivers a clear sound with accurate sonic detail. A switchable 20 dB preattenuation pad and bass cut filter make the Perception 120 an excellent choice for a wide range of recording and live sound applications.Backed by AKG’s si…
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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
Click here to learn more about Drawmer 1960 Mic Pre/Tube Compressor
Studio Projects Vtb-1 Tube Blend Mic Preamp $149.99
The new Studio Projects VTB-1 Tube Blend Mic Preamp is the ultimate in low-cost microphone preamplifier technology. Incorporating true class A/B switching, the VTB-1 is a totally discrete circuit. Unique to the VTB-1 mic preamp is the Tube Drive circuit based on a a 12AX7 tube that allows the user to blend as little or as much of the Tube Drive as desired. The Studio Projects VTB-1 allows the user the most flexibility of any mic pre in its price class.The VTB-1 preamp allows you to go from a pristine solid state sound to any combination of Tube Drive you choose – even hard distortion for guitars and bass! The Studio Projects VTB-1 is must-have device as the perfect mic preamplifier for any microphone!A superb vocal mic pre with warm transparent characterGreat for use as a tube DI boxIdeal for production, broadcast, and voice over workPerfect for the professional and home project studio
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Drawmer 1969 Mercenary Edition Mic Pre Amp/Tube Compressor $2575
The 1969 Mercenary Edition, derived from a collaboration between two of the audio industry’s most established names, Drawmer (UK) and Mercenary Audio (USA), Fletcher – Producer/Engineer, Mercenary Audio incorporates new tube circuits designed to add warmth to mic/line signals, and the instrument (DI) pre-amp has its own tube stage enabling classic overdrive effects when inserting guitar, bass and other instruments. Retaining the concept of twin mic pre-amps, the 1969 uses ‘Burr-Brown’op amps for a silkier sound – and a phase reverse switch available in instrument, mic and line modes increases versatility. The 1969 employs true stereo link operation with channel one’s threshold, attack and release controls becoming master to both channels. Stereo link also offers a BIG position which retains bass frequencies by rolling off the detection signal at 100 Hz minimizing undesirable pumping during compression. Output gain make-up can be independently controlled on each channel. 2 mic/line pre-amps with variable gain, 48V phantom power, filters and phase reverse Instrument tube pre-amp with variable gain, EQ, phase reverse and brightness boost 2 soft-knee tube compressors with variable threshold, attack, release and output gain True stereo link operation with BIGposition for retaining bass frequencies Side chain access and side chain listen facility VU metering of gain reduction and output levels Individual +4dB/-10dB inserts Balanced +4dB XLR input/output connectors
Click here to learn more about Drawmer 1969 Mercenary Edition Mic Pre Amp/Tube Compressor
Used Drawmer 1969 Mercenary Edition Mic Pre Amp/Tube Compressor $2343.25
The 1969 Mercenary Edition, derived from a collaboration between two of the audio industry’s most established names, Drawmer (UK) and Mercenary Audio (USA), Fletcher – Producer/Engineer, Mercenary Audio incorporates new tube circuits designed to add warmth to mic/line signals, and the instrument (DI) pre-amp has its own tube stage enabling classic overdrive effects when inserting guitar, bass and other instruments. Retaining the concept of twin mic pre-amps, the 1969 uses ‘Burr-Brown’op amps for a silkier sound – and a phase reverse switch available in instrument, mic and line modes increases versatility. The 1969 employs true stereo link operation with channel one’s threshold, attack and release controls becoming master to both channels. Stereo link also offers a BIG position which retains bass frequencies by rolling off the detection signal at 100 Hz minimizing undesirable pumping during compression. Output gain make-up can be independently controlled on each channel. 2 mic/line pre-amps with variable gain, 48V phantom power, filters and phase reverse Instrument tube pre-amp with variable gain, EQ, phase reverse and brightness boost 2 soft-knee tube compressors with variable threshold, attack, release and output gain True stereo link operation with BIGposition for retaining bass frequencies Side chain access and side chain listen facility VU metering of gain reduction and output levels Individual +4dB/-10dB inserts Balanced +4dB XLR input/output connectors
Click here to learn more about Used Drawmer 1969 Mercenary Edition Mic Pre Amp/Tube Compressor
Studio Projects VTB-1 Tube Blend Mic Preamp $149.99
The new Studio Projects VTB-1 Tube Blend Mic Preamp is the ultimate in low-cost microphone preamplifier technology. Incorporating true class A/B switching, the VTB-1 is a totally discrete circuit. Unique to the VTB-1 mic preamp is the Tube Drive circuit based on a a 12AX7 tube that allows the user to blend as little or as much of the Tube Drive as desired. The Studio Projects VTB-1 allows the user the most flexibility of any mic pre in its price class.The VTB-1 preamp allows you to go from a pristine solid state sound to any combination of Tube Drive you choose – even hard distortion for guitars and bass! The Studio Projects VTB-1 is must-have device as the perfect mic preamplifier for any microphone!
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Art Pro Channel Tube Mic Preamp $319
The Pro Channel from ART is the latest offering from the world’s most popular tube dynamics processing manufacturer. ART engineers have combined the world-renowned Pro MPA, Pro VLA, and Tube EQ into a single product – creating the world’s best-sounding and most affordable professional recording channel.The Pro Channel features many new and exciting design enhancements to ART’s pro and home studio staples, including the addition of a tube circuit to the compressor module. The Pro Channel allows you to select between ART’s award winning optical/tube compressor or the coveted tube circuit (a design made popular by the sound of the old broadcast limiters – now costing thousands of dollars). The tube circuit is fast, fat and a bit aggressive, and is guaranteed to become a legend among compressors as has the Pro VLA. The four-band parametric equalizer has selectable Q for the two sweepable mid-bands. As with all design elements of the Pro Channel, these Q options were fine-tuned by some of the industry’s top studio and live-sound engineers. Likewise, all new additions were made without compromise to the sound of the original designs (Pro MPA, Pro VLA, Tube EQ), which have become standards in professional studios and FOH rigs around the globe.Professional Tube-Based Microphone/Line Recording ChannelThree independent World-Class modules: tube mic pre, switchable optical/tube compressor, and tube EQWarm, Smooth, and Silky Sound QualityPrecision Detented PotentiometersSelectable VU Metering (mic pre out, compressor out, or Main Out)Tube Character and Gain Reduction LED ArraysBalanced XLR and Unbalanced 1/4″ Inputs and OutputsInsert Points Between Preamp and Compressor, and Compressor and EQThree Hand-Selected Vacuum TubesProfessional Signal Processing For use with any Analog or Digital Recording FormatExceptional Processing Channel For Any Line or Instrument Level SignalFive-Year Warranty
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Used Art Pro Channel Tube Mic Preamp $290.29
The Pro Channel from ART is the latest offering from the world’s most popular tube dynamics processing manufacturer. ART engineers have combined the world-renowned Pro MPA, Pro VLA, and Tube EQ into a single product – creating the world’s best-sounding and most affordable professional recording channel.The Pro Channel features many new and exciting design enhancements to ART’s pro and home studio staples, including the addition of a tube circuit to the compressor module. The Pro Channel allows you to select between ART’s award winning optical/tube compressor or the coveted tube circuit (a design made popular by the sound of the old broadcast limiters – now costing thousands of dollars). The tube circuit is fast, fat and a bit aggressive, and is guaranteed to become a legend among compressors as has the Pro VLA. The four-band parametric equalizer has selectable Q for the two sweepable mid-bands. As with all design elements of the Pro Channel, these Q options were fine-tuned by some of the industry’s top studio and live-sound engineers. Likewise, all new additions were made without compromise to the sound of the original designs (Pro MPA, Pro VLA, Tube EQ), which have become standards in professional studios and FOH rigs around the globe.Professional Tube-Based Microphone/Line Recording ChannelThree independent World-Class modules: tube mic pre, switchable optical/tube compressor, and tube EQWarm, Smooth, and Silky Sound QualityPrecision Detented PotentiometersSelectable VU Metering (mic pre out, compressor out, or Main Out)Tube Character and Gain Reduction LED ArraysBalanced XLR and Unbalanced 1/4″ Inputs and OutputsInsert Points Between Preamp and Compressor, and Compressor and EQThree Hand-Selected Vacuum TubesProfessional Signal Processing For use with any Analog or Digital Recording FormatExceptional Processing Channel For Any Line or Instrument Level SignalFive-Year Warranty
Click here to learn more about Used Art Pro Channel Tube Mic Preamp
Used 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
Click here to learn more about Used Drawmer 1960 Mic Pre/Tube Compressor 889406476844
Manley DMMP Dual Mono Tube Mic Preamp $2970
The Manley DMMP Dual Mono Microphone Preamp is an all-tube microphone primarily intended for use with modern capacitor (condenser) microphones. Now, 40 to 60dB gain, enough for most ribbon mics, is selectable in precise 5dB steps by varying the amount of overall negative feedback on the GAIN switch. This is a very interesting feature, allowing you to change the slew rate (speed), placement, and tonal balance of the sound from mellow and “tubey-er” through to faster, punchier, and more aggressive. Tube complements include 1 x 12AX7EH hand-selected for lowest noise, and 1 x 6414 per channel for each high-current output stage. Each tube preamp in the Manley DMMP is painstakingly hand-wired using silver solder and audiophile-grade components. Double-shielded custom-built power transformers and custom-built high-capacity reservoir capacitors demonstrate Manley’s modern power supply design approach. When you need to get your tunes through some tubes before hitting a sterile digital recorder, the front-panel 1/4″ Direct Input jack lets the Dual Mono Mic Pre serve double duty as a pure tube line stage for instruments such as bass, drum machines, and keyboards. Total gain in this mode becomes 20dB less than indicated on the Gain switch. Both transformer-coupled balanced, and direct (via humongous metalized film MultiCaps) capacitor-coupled unbalanced outputs are provided giving you the choice of audiophile/purist or big iron sounds. Perennial shoot-out winners, Manley single-ended preamp designs have become favorites among top engineers and home recordists looking for “that rich Manley sound with the tight bass and the top end that goes on forever” which begs to go direct to tape. It’s a BIG sounding mic preamp.What’s so cool about variable Feedback?The Manley tube microphone preamp’s global negative feedback takes a small portion of the output signal and re-injects it back into the input stage, which greatly improves linearity and distortion performance of an amplifier. A tasteful amount of negative feedback is the key: too much and you’re into poor transient response and phase shift problems. Manley generally uses somewhere between 4 to 14dB of feedback in their line preamplifiers. Within that window is a definite point of maximized stability with optimum sonic performance, giving you the choice of where you want to be. Changing the amount of feedback alters the overall gain of the amplifier as well as the slew rate (speed).In the context of a hifi amplifier or preamplifier with the Variable Feedback feature, EveAnna (Manley) uses variable feedback to suit different CD’s and recording styles when she’s listening to music at home. “For the most part I keep the variable feedback controls around the middle but sometimes when I’m playing a CD which is kind of harsh and aggressive sounding or I just want to mellow out, I just turn those controls down and apply mor
Click here to learn more about Manley DMMP Dual Mono Tube Mic Preamp
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The Manley DMMP Dual Mono Microphone Preamp is an all-tube microphone primarily intended for use with modern capacitor (condenser) microphones. Now, 40 to 60dB gain, enough for most ribbon mics, is selectable in precise 5dB steps by varying the amount of overall negative feedback on the GAIN switch. This is a very interesting feature, allowing you to change the slew rate (speed), placement, and tonal balance of the sound from mellow and “tubey-er” through to faster, punchier, and more aggressive. Tube complements include 1 x 12AX7EH hand-selected for lowest noise, and 1 x 6414 per channel for each high-current output stage. Each tube preamp in the Manley DMMP is painstakingly hand-wired using silver solder and audiophile-grade components. Double-shielded custom-built power transformers and custom-built high-capacity reservoir capacitors demonstrate Manley’s modern power supply design approach. When you need to get your tunes through some tubes before hitting a sterile digital recorder, the front-panel 1/4″ Direct Input jack lets the Dual Mono Mic Pre serve double duty as a pure tube line stage for instruments such as bass, drum machines, and keyboards. Total gain in this mode becomes 20dB less than indicated on the Gain switch. Both transformer-coupled balanced, and direct (via humongous metalized film MultiCaps) capacitor-coupled unbalanced outputs are provided giving you the choice of audiophile/purist or big iron sounds. Perennial shoot-out winners, Manley single-ended preamp designs have become favorites among top engineers and home recordists looking for “that rich Manley sound with the tight bass and the top end that goes on forever” which begs to go direct to tape. It’s a BIG sounding mic preamp.What’s so cool about variable Feedback?The Manley tube microphone preamp’s global negative feedback takes a small portion of the output signal and re-injects it back into the input stage, which greatly improves linearity and distortion performance of an amplifier. A tasteful amount of negative feedback is the key: too much and you’re into poor transient response and phase shift problems. Manley generally uses somewhere between 4 to 14dB of feedback in their line preamplifiers. Within that window is a definite point of maximized stability with optimum sonic performance, giving you the choice of where you want to be. Changing the amount of feedback alters the overall gain of the amplifier as well as the slew rate (speed).In the context of a hifi amplifier or preamplifier with the Variable Feedback feature, EveAnna (Manley) uses variable feedback to suit different CD’s and recording styles when she’s listening to music at home. “For the most part I keep the variable feedback controls around the middle but sometimes when I’m playing a CD which is kind of harsh and aggressive sounding or I just want to mellow out, I just turn those controls down and apply more feedback to get a smoother, richer texture. But when I’m the one in the aggressive mood, I c
Click here to learn more about Manley Dmmp Dual Mono Tube Mic Preamp
Art Voice Channel Tube Mic Preamp $429
The ART VoiceChannel is the answer to your recording and computer audio interface needs. Built to provide the ideal all-in-one input solution for analog or digital recording, the ART VoiceChannel is a true second-generation discrete Class-A microphone preamp capable of providing clean quiet gain while maintaining incredible transparency. An integrated fully variable powerful dynamics processor subtly controls transients and noise of the most demanding sources while the VoiceChannel’s semi-parametric EQ offers wide tunability. For added versatility the EQ can be patched before or after the dynamics processor while separate insertion jacks allow you quick quiet in-line connectivity to external signal processing gear immediately after the mic pre-amp, before the EQ and dynamics processor in the signal path. Another insert patch point exists just before the A/D converters. Choose between a wide range of outputs including balanced analog output, 44.1 KHz to 192 KHz AES/EBU, S/PDIF, ADAT and USB. Both analog and digital meters provide a detailed indication of audio levels.Ideal input solution for any recording applicationTube microphone preamplifier with selectable plate voltage and variable Input impedanceExceptional warmth and definition from proven ART tube preamp designSmooth musical-sounding dynamics control including Compressor, Expander, De-Esser, GatePowerful parametric EQ selectable pre- or post-compressor in signal pathFlexible digital connectivity including ADAT Lite-pipe, AES/EBU, S/PDIF, TOSLink digital outputUSB direct-connect to computer or laptop
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Used Art Voice Channel Tube Mic Preamp $363.09
The ART VoiceChannel is the answer to your recording and computer audio interface needs. Built to provide the ideal all-in-one input solution for analog or digital recording, the ART VoiceChannel is a true second-generation discrete Class-A microphone preamp capable of providing clean quiet gain while maintaining incredible transparency. An integrated fully variable powerful dynamics processor subtly controls transients and noise of the most demanding sources while the VoiceChannel’s semi-parametric EQ offers wide tunability. For added versatility the EQ can be patched before or after the dynamics processor while separate insertion jacks allow you quick quiet in-line connectivity to external signal processing gear immediately after the mic pre-amp, before the EQ and dynamics processor in the signal path. Another insert patch point exists just before the A/D converters. Choose between a wide range of outputs including balanced analog output, 44.1 KHz to 192 KHz AES/EBU, S/PDIF, ADAT and USB. Both analog and digital meters provide a detailed indication of audio levels.Ideal input solution for any recording applicationTube microphone preamplifier with selectable plate voltage and variable Input impedanceExceptional warmth and definition from proven ART tube preamp designSmooth musical-sounding dynamics control including Compressor, Expander, De-Esser, GatePowerful parametric EQ selectable pre- or post-compressor in signal pathFlexible digital connectivity including ADAT Lite-pipe, AES/EBU, S/PDIF, TOSLink digital outputUSB direct-connect to computer or laptop
Click here to learn more about Used Art Voice Channel Tube Mic Preamp
Art Usb Dual Tube Pre $149
The ART USBDualTubePre is a compact, dual-channel tube preamp designed for any basic recording system. Capable of operating as a standalone unit with USB audio interface, or as an expander for any digital system with S/PDIF digital input, each channel in the USBDualTubePre delivers superior tube tone in a fully featured input strip.Each input of the USBDualTubePre has independent input gain control and output level, phase inversion, low frequency roll-off, true 48V phantom power, and a user-defeatable optocompressor circuitcapable of ensuring superior dynamic control of any input source.For monitoring, an 1/8″ mini headphone jack with level and monitor mix controls allow latency-free monitoring of the inputs while recording, as well as playback monitoring of audio mix via USB bus. The monitor mix is also routed to 1/4″ TRS (balanced) outputs with separate level control for control room monitor source.The USB interface is fully USB compliant. No special drivers are needed.Two-channel tube-based Mic/Instrument preamp computer interfaceExtremely low noise discrete front end with variable input and output controlsAdvanced optical output compressor to simplify recording and prevent overloadUSB connectivity to desktop and laptop computersS/PDIF output for expanding inputs on digital workstations and computer interfacesLatency free Monitoring Mix and Level controlsBalanced XLR for lo-Z applications and 1/4″ hi-Z inputs for instrument DI applicationsSeparate Gain, Phase Invert, Low Cut Filter and Compressor switches on each inputSelectable Dual or Stereo operation of output controlsSwitch selectable Inserts on each channelInsert jacks provide a preamp direct out for each channelStereo/ Dual operation of Optical CompressorMono switch for single input monitoringS/PDIF Sample Rate switch selectable between 44.1K and 48KPrecision LED metering of both the preamp and A/D sectionsBuilt-in low noise +48 Volt phantom power supplyCompact, stackable all aluminum chassis
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ART Voice Channel Tube Mic Preamp $429
The ART VoiceChannel is the answer to your recording and computer audio interface needs. Built to provide the ideal all-in-one input solution for analog or digital recording, the ART VoiceChannel is a true second-generation discrete Class-A microphone preamp capable of providing clean quiet gain while maintaining incredible transparency. An integrated fully variable powerful dynamics processor subtly controls transients and noise of the most demanding sources while the VoiceChannel’s semi-parametric EQ offers wide tunability. For added versatility the EQ can be patched before or after the dynamics processor while separate insertion jacks allow you quick quiet in-line connectivity to external signal processing gear immediately after the mic pre-amp, before the EQ and dynamics processor in the signal path. Another insert patch point exists just before the A/D converters. Choose between a wide range of outputs including balanced analog output, 44.1 KHz to 192 KHz AES/EBU, S/PDIF, ADAT and USB. Both analog and digital meters provide a detailed indication of audio levels.
Click here to learn more about ART Voice Channel Tube Mic Preamp