Microphone Tube Preamp
Microphone Tube Preamp
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Blue ROBBIE Tube Microphone Preamp $799 Elegance and simplicity are the driving forces behind Blue's design philosophy, and the ROBBIE tube premap is no exception. This Class-A discrete tube microphone and instrument preamp features the same technical build quality and commitment to excellence for which Blue is known. Yields excellent detail with extremely low noise and ultrahigh gain. The warm, robust tube gain stage is the perfect enhancement for condenser microphones. Frequency response is 10Hz to 100kHz, ±2dB. |
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Blue Robbie Tube Microphone Preamp $799 Elegance and simplicity are the driving forces behind Blue's design philosophy, and the ROBBIE tube premap is no exception. This Class-A discrete tube microphone and instrument preamp features the same technical build quality and commitment to excellence for which Blue is known. Yields excellent detail with extremely low noise and ultrahigh gain. The warm, robust tube gain stage is the perfect enhancement for condenser microphones. Frequency response is 10Hz to 100kHz, 2dB. Class-A single-channel discrete tube microphone and instrument preamplifierDiscrete, balanced components from input to outputSimple designFront panel features a large backlit gain knob and Hi-Z 1/4" instrument input Inputs: one XLR microphone, one 1/4" TS phone instrumentOutput: one XLR linePhantom power |
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Nady TMP-1 Rackmount Mono Tube Microphone Preamp $72.79 The Nady TMP-1 is a mono tube microphone preamp with amazing warmth and clarity from 12AX7A vacuum tube circuitry. Selectable output limiter circuitry, analog VU meter, variable input and output gain controls, +48V phantom power switch, phase reversal switch, servo-balanced XLR and unbalanced 1/4" inputs and outputs, plus shielded internal dual regulated power supply add up to fantastic flexibility. |
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Electro-Harmonix 12AY7 Tube Microphone Preamp 886830181436 $146.03 With the Electro-Harmonix 12AY7 Tube Microphone Preamp, Electro-Harmonix offers an affordable tube micrphone preamp that won't disappoint. Equipped with a 12AY7 EH tube and a 12AU7 EH driver, it gives microphones the widest dynamic range with the warmest possible tone and accuracy. The 12AY7 Mic Pre uses an actual 200V supply instead of the "faked out" 12 or 48 volts you'd get with common models and delivers 50dB of gain into a high impedance load or 40dB gain into 600 ohms. The 12AY7 Mic Preamp's special FET current-balancing circuit allows the tubes to amplify the microphone signal to line level while eliminating noise and protecting against hum and hostile electrical environments. It has an extra TRS output for separate line control, which can be used as a splitter or an aux send for monitoring. Input connections are balanced in and out (XLR) with a 1/4" TRS balanced buffer out. The Electro-Harmonix mic pre unit also boasts a phase reverse switch and a +4dBm indicator light for setting optimal mic level. The 48V phantom power is soft starting and pop-free. |
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Electro-Harmonix 12AY7 Tube Microphone Preamp 889406756632 $97.35 With the Electro-Harmonix 12AY7 Tube Microphone Preamp, Electro-Harmonix offers an affordable tube micrphone preamp that won't disappoint. Equipped with a 12AY7 EH tube and a 12AU7 EH driver, it gives microphones the widest dynamic range with the warmest possible tone and accuracy. The 12AY7 Mic Pre uses an actual 200V supply instead of the "faked out" 12 or 48 volts you'd get with common models and delivers 50dB of gain into a high impedance load or 40dB gain into 600 ohms. The 12AY7 Mic Preamp's special FET current-balancing circuit allows the tubes to amplify the microphone signal to line level while eliminating noise and protecting against hum and hostile electrical environments. It has an extra TRS output for separate line control, which can be used as a splitter or an aux send for monitoring. Input connections are balanced in and out (XLR) with a 1/4" TRS balanced buffer out. The Electro-Harmonix mic pre unit also boasts a phase reverse switch and a +4dBm indicator light for setting optimal mic level. The 48V phantom power is soft starting and pop-free. |
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Electro-Harmonix 12AY7 Tube Microphone Preamp $194.7 With the Electro-Harmonix 12AY7 Tube Microphone Preamp, Electro-Harmonix offers an affordable tube micrphone preamp that won't disappoint. Equipped with a 12AY7 EH tube and a 12AU7 EH driver, it gives microphones the widest dynamic range with the warmest possible tone and accuracy. The 12AY7 Mic Pre uses an actual 200V supply instead of the "faked out" 12 or 48 volts you'd get with common models and delivers 50dB of gain into a high impedance load or 40dB gain into 600 ohms. The 12AY7 Mic Preamp's special FET current-balancing circuit allows the tubes to amplify the microphone signal to line level while eliminating noise and protecting against hum and hostile electrical environments. It has an extra TRS output for separate line control, which can be used as a splitter or an aux send for monitoring. Input connections are balanced in and out (XLR) with a 1/4" TRS balanced buffer out. The Electro-Harmonix mic pre unit also boasts a phase reverse switch and a +4dBm indicator light for setting optimal mic level. The 48V phantom power is soft starting and pop-free. |
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Nady Tmp-1 Rackmount Mono Tube Microphone Preamp $79.99 The Nady TMP-1 is a mono tube microphone preamp with amazing warmth and clarity from 12AX7A vacuum tube circuitry. Selectable output limiter circuitry, analog VU meter, variable input and output gain controls, +48V phantom power switch, phase reversal switch, servo-balanced XLR and unbalanced 1/4" inputs and outputs, plus shielded internal dual regulated power supply add up to fantastic flexibility.Mono tube preampWarmth and clarity of 12AX7A vacuum tube circuitrySelectable output limiter circuitryAnalog VU meterVariable input and output gain controls+48V phantom power switchPhase reversal switchServo-balanced XLR and unbalanced 1/4" inputs and outputsShielded internal dual regulated power supply |
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Electro-Harmonix 12Ay7 Tube Microphone Preamp $194.7 With the Electro-Harmonix 12AY7 Tube Microphone Preamp, Electro-Harmonix offers an affordable tube micrphone preamp that won't disappoint. Equipped with a 12AY7 EH tube and a 12AU7 EH driver, it gives microphones the widest dynamic range with the warmest possible tone and accuracy. The 12AY7 Mic Pre uses an actual 200V supply instead of the "faked out" 12 or 48 volts you'd get with common models and delivers 50dB of gain into a high impedance load or 40dB gain into 600 ohms. The 12AY7 Mic Preamp's special FET current-balancing circuit allows the tubes to amplify the microphone signal to line level while eliminating noise and protecting against hum and hostile electrical environments. It has an extra TRS output for separate line control, which can be used as a splitter or an aux send for monitoring. Input connections are balanced in and out (XLR) with a 1/4" TRS balanced buffer out. The Electro-Harmonix mic pre unit also boasts a phase reverse switch and a +4dBm indicator light for setting optimal mic level. The 48V phantom power is soft starting and pop-free.Equipped with a 12AY7 EH tube and a 12AU7 EH driverWide dynamic range, warm tone, and superb accuracy200V supply delivers 50dB of gain into high load, 40dB gain into 600 ohmsFET current-balancing mic preamp circuitry eliminates noise and humTRS output for separate line control (use as a splitter or for monitoring)Balanced XLR in and out1/4" TRS balanced buffer out Phase reverse switch+4dBm indicator light for setting optimal mic level48V phantom power with soft start |
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ART Tube MP Project Series Tube Microphone/Instrument Preamp $69 The ART TUBE MP Project Series Preamp for Microphone and Instrument can also make your voice sound fabulous, warmed and made silky smooth by the genuine 12AX7A tube inside. A makeover of the popular original, the Tube MP features an ultralow-noise discrete mic preamp front end that has an extremely flat, wide frequency response and can handle very low and high signal levels with minimum coloration. High impedance instrument input bypasses the mic preamp circuitry for a shorter signal path. External power supply minimizes AC line noise and hum.Input gain control and switch maximizes dynamic range of input and lets you control how hard you drive the tube. Switchable input impedance on the XLR in optimizes mic response. Bessel switchable low-cut filter removes rumble and wind noise. Set at 40Hz, it won't overly affect bass tonality. XLR input features phantom power of +48V DC from a very quiet internal high voltage power supply.The Tube MP Project Series Preamp has an FET limiter with fast attack and musical release times that protect other gear in the chain without compression. This allows you to maximize the dynamic range of your signal before converting to digital. A phase invert switch lets you switch signal polarity at the source to minimize cancellation. Output control after the tube and limiter matches output level to a wide variety of systems. Added output section at the end of the signal path has enhanced signal drive capability to both output jacks. |
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Refurbished Art Tube Mp Project Series Tube Microphone/Instrument Preamp $49.99 The ART TUBE MP Project Series Preamp for Microphone and Instrument can also make your voice sound fabulous, warmed and made silky smooth by the genuine 12AX7A tube inside. A makeover of the popular original, the Tube MP features an ultralow-noise discrete mic preamp front end that has an extremely flat, wide frequency response and can handle very low and high signal levels with minimum coloration. High impedance instrument input bypasses the mic preamp circuitry for a shorter signal path. External power supply minimizes AC line noise and hum.Input gain control and switch maximizes dynamic range of input and lets you control how hard you drive the tube. Switchable input impedance on the XLR in optimizes mic response. Bessel switchable low-cut filter removes rumble and wind noise. Set at 40Hz, it won't overly affect bass tonality. XLR input features phantom power of +48V DC from a very quiet internal high voltage power supply.The Tube MP Project Series Preamp has an FET limiter with fast attack and musical release times that protect other gear in the chain without compression. This allows you to maximize the dynamic range of your signal before converting to digital. A phase invert switch lets you switch signal polarity at the source to minimize cancellation. Output control after the tube and limiter matches output level to a wide variety of systems. Added output section at the end of the signal path has enhanced signal drive capability to both output jacks.XLR and 1/4" ins with selectable phantom powerGain knobOutput knobGain switchImpedance switchFilter switchPhantom power switchLimiter switchPhase switchSignal/clip meter |
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Art Tube Mp Project Series Tube Microphone/Instrument Preamp $69 The ART TUBE MP Project Series Preamp for Microphone and Instrument can also make your voice sound fabulous, warmed and made silky smooth by the genuine 12AX7A tube inside. A makeover of the popular original, the Tube MP features an ultralow-noise discrete mic preamp front end that has an extremely flat, wide frequency response and can handle very low and high signal levels with minimum coloration. High impedance instrument input bypasses the mic preamp circuitry for a shorter signal path. External power supply minimizes AC line noise and hum.Input gain control and switch maximizes dynamic range of input and lets you control how hard you drive the tube. Switchable input impedance on the XLR in optimizes mic response. Bessel switchable low-cut filter removes rumble and wind noise. Set at 40Hz, it won't overly affect bass tonality. XLR input features phantom power of +48V DC from a very quiet internal high voltage power supply.The Tube MP Project Series Preamp has an FET limiter with fast attack and musical release times that protect other gear in the chain without compression. This allows you to maximize the dynamic range of your signal before converting to digital. A phase invert switch lets you switch signal polarity at the source to minimize cancellation. Output control after the tube and limiter matches output level to a wide variety of systems. Added output section at the end of the signal path has enhanced signal drive capability to both output jacks.XLR and 1/4" ins with selectable phantom powerGain knobOutput knobGain switchImpedance switchFilter switchPhantom power switchLimiter switchPhase switchSignal/clip meter |
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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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Used Presonus Tubepre Microphone Preamp $71.89 The PreSonus TubePRE Microphone Preamp lets you add character to your signal by varying the amount of gain and tube drive. A 12AX7 tube in this single-channel mic preamp fattens your signal while dual-servo gain stages let you simultaneously output to your amp and console. Sterling specs include 10Hz-80kHz frequency response, a 94dB noise floor, and >90dB S/N ratio. Capacitor-free circuitry and wide dynamic control give you a big boost without noise. Includes 48V phantom power, phase reverse, 20dB pad, and 80Hz rumble filter. A large VU meter with a cool blue backlight keeps you informed. Balanced/unbalanced and XLR I/O give the PreSonus TubePRE flexibility. Great as a studio direct box.12AX7 and dual-servo gain stagesCapacitor-free gain stage for maximum fidelity and low noiseXLR mic and high-Z instrument inputs on back panelXLR (balanced) and 1/4" (unbalanced) outputs on back panelSupports dual output of signal10Hz-80kHz frequency response>90dB S/N ratio94dB noise floorVariable gain and tube driveGain: 3dB to +48dBTube drive: 0dB to +20dB48V phantom power-20dB pad and polarity reverse80Hz rumble filterLarge VU meter with blue backlightExternal wallmount power transformerRackmountable with optional adapter |
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 Telefunken V72 V 72 Siemens Preamp PowerXLRs ready PERFECT WORKING  US $1,295.00
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 ART DPS II Preamp System with Dual Tube Mic Preamps US $130.00
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 ART TPS ii Mic Tube Pre Amp US $95.00
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 ART TUBE MP PROJECT SERIES INSTRUMENT MICROPHONE PREAMP MIC PREAMPLIFIER US $59.99
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 Behringer MIC200 TUBE ULTRAGAIN Tube Preamp w Modeling US $45.00
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 Nady Audio TMP 1 Tube Mic Preamp US $48.99
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 Art Tube MP Project Series Tube Preamp US $20.50
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 Art Studio MP Microphone Preamp Preamplifier for Ham Radio Microphone US $15.00
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 PRESONUS BLUE TUBE DP 2 CHANNEL MICROPHONE INSTRUMENT TUBE PREAMPLIFIER US $81.00
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 Universal Audio 2 610 mic pre amp US $1,300.00
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 Universal Audio 610 Solo US $850.00
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 APHEX 107 2 Channel Thermionic Microphone Preamp Tubessence Rack Mount US $89.00
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 PPA Audio Tube Condenser Mic w Separate Power Supply US $41.00
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 Summit Audio 2BA 221 Microphone and Line Module Preamp US $405.00
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 ART TUBE MP PROJECT SERIES Tube Mic MICROPHONE PREAMP WBox and adapter free ship US $70.00
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 Sennheiser MKH 416 Short Shotgun Interference Tube Mic w Zoom H4n XLR Cable US $999.95
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 Bellari MP105 Tube Microphone Preamp US $39.99
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 ART TPS II 2 Channel Variable Impedance Tube Preamp US $125.00
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 ART Tube MP Studio Mic Preamp US $29.99
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 Blue Robbie Class A Discrete Tube Mic instrument preamp US $799.95
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 NEW CAD Trion 8000 Mic Power Supply Cable Case US $399.99
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 En Voice MindPrint Tube Mic Pre Amp Pristine Condition US $330.00
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 2 Pieces Guavatone Orange 86 DIY EF86 Tube Mic Preamp PCB Redd 47 Circuit US $75.00
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 PreSonus TubePre Microphone Tube Preamp US $51.00
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 Universal Audio LA 610 Lightly Used in Original Box w Vintage USA Tubes US $787.77
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 ART Tube MP Studio V3 Desktop Mic Pre With Limiter US $11.61
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 BEHRINGER ULTRAGAIN PRO MIC2200 PRE AMP NO RESERVE BUY IT NOW FREE SHIPPING USA US $109.88
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 NEW Behringer T 47 Studio Vacuum Tube Condenser Mic BUY IT NOW FREE SHIPPING US $169.88
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 Art M One and Tube MP Home Recording Studio Package with 2 XLRs and Pop Filter US $89.00
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 Sony sra 3 Tube Mic Microphone and Instrument Pre Amp US $499.00
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 TL Audio PA 2 PA2 Dual Channel Tube Preamp US $500.00
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 5 pieces Sylvania 5840 Tube Altec Mic US made NOS tested US $20.00
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 TUBEPre Microphone Preamp by Presonus fattens up vocals gtr bass keyboard US $45.00
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 STERLING AUDIO Groove Tube ST 51 ST51 STUDIO CONDENSER MICROPHONE USED US $49.99
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 BEHRINGER TUBE ULTRAGAIN MIC100 Vacuum Tube Preamplifier w Limiter Spare Tube US $28.99
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 Presonus Bluetube DP Dual Channel Tube Microphone Preamp Blue Tube GREAT US $61.00
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 Presonus Blue Tube 2 Chan Mic Instrument Pre Amp US $90.00
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 PreSonus Tube Pre US $60.00
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 Avalon VT 737SP Tube Mic Pre Channel Strip USED SWEET US $1,000.00
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 Manley TNT 2 Channel Microphone Preamp 1 Tube Channel 1 Discreet Solid State US $2,199.00
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 Bellari MP105 Round Sound Tube Mic Preamp US $24.99
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 Collins 356A 1 Tube Microphone Preamplifier Mic Preamp US $315.00
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 Universal Audio SOLO 610 TUBE Microphone Preamplifier warm vintage tone US $200.00
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 BELLARI VP130 Tube the new vp129 vp 130 In Stock PROAUDIOSTAR US $239.00
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 PRESONUS TUBEPRE SINGLE CHANNEL MICROPHONE PRE AMP P405 US $24.99
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 ART Professional Tube Mic Pre Amp US $49.99
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 Stellar CM 6 EF86 EF806 Tube Condensor Microphone US $415.99
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 BRAND NEW Studio Projects VTB1 US $145.00
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 APEX 460 apex460 authorized dealer PROAUDIOSTAR US $209.00
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 Presonus Eureka mic preamp comp eq with Linear Technology preamp chips US $349.99
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ART Tube MP Studio V3 Microphone Preamp and Limiter with Presets List Price: $119.00 Sale Price: $69.95 Used From: $64.99  |
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The Tube MP Studio V3 features ART's V3 (variable Valve Voicing) technology - found only in ART microphone preamplification systems. Provides superior preamplification for microphones, instruments, and line level sources... |
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ART Tube MP Project Series Microphone Preamp List Price: $89.00 Sale Price: $56.99 Used From: $45.44 |
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The Tube MP Project Series is a professional quality audio interface that lets you connect microphone, instrument, and line level signals to a mixer or other audio input. This hybrid design is the latest in a long line of ART tube preamps... |
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ART Tube MP USB Project Series Tube Microphone Preamp With USB List Price: $129.00 Sale Price: $83.99 Used From: $74.95 |
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The Tube MP Project Series is a professional quality audio interface that lets you connect microphone, instrument, and line level signals to audio inputs to digital audio workstations as well as standard analog devices... |
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ART Tube MP Studio Mic Preamp List Price: $86.00 Sale Price: $29.99 Used From: $29.00 |
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The original Tube MP made pro-caliber tube preamping available to ordinary musicians and home studios. The MP Studio goes a step further by adding a VU meter for better level control and ART's OPL (Output Protection Limiter), which controls and maintains the output peak signal to protect hard-disk recording systems and soundcards... |
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ART Tube MP Microphone Preamp List Price: $59.00 Sale Price: $39.95 Used From: $14.99 |
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The Tube MP is a tube mircrophone preamp that offers a superb level of sound quality, using a special tube and integrated circuit design combined with a straightforward user interface to quickly and easily access all of its many features... |
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ART Tube PAC Microphone Preamp/Compressor List Price: $159.00 Used From: $80.00 |
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The ART Tube PAC is a combination of the world's most popular tube mic/line preamp and optical tube compressor. ART engineers took the Tube MP and Tube Compressor and combined them into a single, convenient, aircraft-quality extruded aluminum chassis... |
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PreSonus BlueTube DP 2-Channel Vacuum Tube Dual-Path Mic Pre List Price: $229.95 Sale Price: Too low to display Used From: $185.00 |
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The new BLUETUBE DP two channel microphone/instrument preamplifier with Dual Path technology delivers the best of both worlds offering a solid state preamplifier stage and a tube preamplifier stage in each channel... |
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PreSonus Tubepre Single-Channel Vacuum Tube Mic Pre List Price: $129.95 Sale Price: $99.00 Used From: $59.99 |
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The TubePRE is the highest quality vacuum tube preamp in its class. Loaded with PreSonus award winning dual servo preamplifier, the TubePre affordably delivers low noise tube warmth for vocals, guitars, bass guitars, synths and sound modules... |
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Behringer MIC100 Vacuum Tube Preamplifier with Limiter List Price: $77.99 Sale Price: $38.99 Used From: $33.19 |
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Tubes can really warm up a signal fast, giving it depth and character. Though transistors have succeeded the technology, many musicians agree that tubes deliver superior sound. BEHRINGER's TUBE ULTRAGAIN MIC100 gives anything from microphones to acoustic or bass guitars that vintage tube vibe in a dependable, affordable package... |
Mesa Boogie Mark Series
The 'Mesa Boogie Mark Series is a series of guitar amplifier drafted by Mesa Engineering. It was Mesa's flagship yield until the introduction of the Rectifier series, and the amplifiers are very collectable.
The very first Mark I was drafted in 1969, past Smith, as a jest, corrected Barry Melton's (Country Joe and the Fish) Fender Princeton amplifier. He extracted the yardstick 10 inch speaker and corrected the chassis to fit the enlarged transformers that were was deficient by the 4-10 tweed Fender Bassman, the circuit that he had supplemental into the 12 watt Princeton. Finally, mounting a 12 inch JBL D-120, a republican speaker of the time, Smith had written what would be the first Boogie. Randall Smith took the "hot-rodded" Princeton into the front store.
Coincidentally, Carlos Santana was prevailing and "wailed through that tiny amp until population were blocking the sidewalk." Impressed, Santana articulated Smith, "Man, that tiny amp truly boogies!", consequently delivering the existing call for the amplifier and the company. "Mark I" is the moniker given to the first Boogies ever drafted, even so they were not summoned "Mark I" until the Mark II came along. They were 100 or 60 watts combo amps with a 12-inch speaker, at the start Altec-Lansing 417-8H Series II.
The Mark I had couple channels: one bathe (voiced quite interchangeable to the original Fender) summoned "Input 2," and one "high gain," summoned "Input 1," which effected the overdriven "Boogie lead" utterances adapted bulk notably by Carlos Santana on the "Abraxas" album, and later by The Rolling Stones, with Keith Richards and Ron Wood including the amps survive from 1977 until 1993 and in the studio on classic albums as Some Girls and Tattoo You.
This amp in its original variety is very collectable, but does not have footswitching capabilities--one plugs into one or the other input for the couple tones. Reverb was optional, and not prevailing on more early Boogies. Later, Mark I models were available with reverb and/or graphic EQ. Early models have "slave out" and "reverb" labeled on the behind with Dymo stick; they do not have any "pull lead" competency on the volume controls. Later models had "Pull Bright" and "Pull Boost" on the volume controls.
The front panel controls were Volume 1, Volume 2, Treble, Middle, Bass, and Master. These early models are rightly differing, since more of them were "custom" models, alone fitted out for various buyers. Mesa/Boogie has stated the original and the reissue have a "looser" lead utterances since the first couple preamp points in time eventuates in the past the tone controls. In the various later Mark II and III models, there is simply one gain point in time in the past the tone controls. This indication chain is an subject of numerous contest among Boogie owners. The Mark II introduced channel footswitching, and wasn't referred to as the "Mark IIA" until the Mark IIB was issued.
It was also available as a chief, which could be hooked higher to a diagram of dissimilar speaker combinations, even so a 1x12 cabinet was typical. However, the reverb circuit is considered noisy and the Waxed Cotton Cordspy voice recorder footswitching drafted a popping utterances past used; both of these attributes were later transformed on the Mark IIC. The preamp gain on the Mark IIs eventuates later the tone controls and so, according to Mesa/Boogie, the IIA has a "tighter, more fled accent on sound" than the Mark I.
The IIA and IIB, and numerous late-model Mark I amps, adapted a silicon implement summoned "fetron" in place of one of the 12AX7 preamp tubes, and included a switch for configuring the amp for either fetron or 12AX7 operation. The intent for including a fetron was to appraise numerous of the difficulties joined with microphonic 12AX7 tubes in a high-gain situation; its exercise was later discontinued. The Mark III was launched by Mesa/Boogie in 1985.
It introduced a third channel, a "crunch" rhythm utterances right in between the rhythm and lead channels. This amp has a many footswitch system: one footswitch replacements between the existing rhythm mode and the lead mode, and the other decides either the bathe rhythm mode or the crunch rhythm mode. The couple rhythm modes detail all of their controls, where the lead mode simply allocations the rhythm modes' tone heap, featuring independent gain and master volume controls. The Mark III suspended demonstration in 1989.
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