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Middle Atlantic VTB-1 Tube Blend Mic Preamp  

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The VTB-1 from Studio Projects is a low-cost, single-channel tube blend mic preamplifier that incorporates true class A/B switching. The VTB-1 is a totally discrete circuit with a unique "Tube Drive" ... Click To Read More About This Product

Available 06-02-2017 You will not be charged until order ships. Email me when this is in stock.

Gear returned in mint condition. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
Gear returned in great condition, with only minor signs of use, such as slight scuffs or pick marks. It looks and plays like new and may be considered an equivalent to display units found in retail stores.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
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The VTB-1 from Studio Projects is a low-cost, single-channel tube blend mic preamplifier that incorporates true class A/B switching. The VTB-1 is a totally discrete circuit with a unique "Tube Drive" function that gives you the ability to blend as little, or as much of the Tube Drive as you want. The VTB-a 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, making this a must have mic preamp for any recording application.

  • 48 Volt Phantom Power
  • Phase Reverse
  • Variable Input Gain Control On Detented Pot
  • 1/4" D.I. Jack On Front Panel
  • High Pass Filter
  • Descrete Solid State Class A/B Design
  • TRS Insert
  • Mic/Line Switch
  • VariableTube Blend On Detented Pot
  • Meter Read Select Between Input and Output level
  • Switchable Impedance between 50/200 Ohm
  • 5 position LED metering
  • XLR mic input
  • Balanced outputs on XLR and 1/4"
  • External AC Power Supply For extreme Low Noise Operation
  • Maximum Gain :
    Mic In to Bal Out: 72dB (60dB preamp gain, 12dB output gain)
    Line In to Bal Out: 42dB (30dB preamp gain, 12dB output gain)
    Distortion/Noise (THD + Noise):
    -20dBu input-Mic; 0dBu input-Line
    Both measured at +15dBu output
    Mic or Line In to Bal or Line Out: <0.0015% (Blend set full CCW- no tube)
    Mic EIN: -128dBu (150 ohm source, 60dB gain)
    Frequency response (20-20kHz, ref 1kHz):
    -20dBu input, +15dBu output
    Mic In to Bal Out: +0 /-0.25 dB
    0dBu input, +15dBu output
    Line In to Bal Out: +0 /-0.5 dB
    Phase response
    <+/- 15 degrees
    Input impedance:
    Mic Input (Rear switch in 200 ohm position): 2000 ohms
    Mic Input (Rear switch in 50 ohm position): 300 ohms
    Line Input (Front panel TRS jack): 1.5 meg ohms
    Output impedance:
    Male-XLR Balanced Output: 100 ohms (50 ohms each leg)
    TRS Line Out: 300 ohms (Impedance Balanced)
    Insert Jack (TRS):
    Nominal level approx 0dBu
    Located between SS preamp stage and tube/output stage
    Tip=Send: 50 ohms output impedance
    Ring=Return: 7500 ohms input impedance
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  • Customer Reviews

Review Snapshot

by PowerReviews
Middle AtlanticVTB-1 Tube Blend Mic Preamp

(based on 3 reviews)

Ratings Distribution

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Reviewed by 3 customers

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(9 of 10 customers found this review helpful)


A good studio tool

By Fuzzball

from Ida, MI

Comments about Middle Atlantic VTB-1 Tube Blend Mic Preamp:

Unlike a ART DPS I liked this preamp on vocal tracks. I found this mic preamp to be a solid all around project studio tool. I did not find the preamp to be anything spectacular for any particular application but if you need a good all around preamp this may work for you. The preamp does provide a significant mount of noise free amplification but it did not seem to really make anything seem warm. It is not a good mic preamp if you like a clear transparent sound. On the bright side I found that the preamp did not seem to muddy up a mix after adding more than 12 tracks making this a handy tool to have in the studio.

(4 of 6 customers found this review helpful)


Nice mic-preamp for the money

By Smitty265

from North Yarmouth, ME

Comments about Middle Atlantic VTB-1 Tube Blend Mic Preamp:

I needed a good, all-around mic preamp for my project studio and I'm pretty limited on budget. The Studio Projects VTB-1 has fit the bill perfectly. It works well for tracking vocals and the tube blend adds a nice warmth. It also works reasonably well as a DI box. These are my two main studio needs for a preamp and this does the job nicely. It can provide a really clean, crisp sound if you turn the tube blend knob all the way down and dialing from 0 - 50% tube blend adds in a nice warmth. That describes, from my perspective, the effective range of the product, from clean and crisp to moderately warm. It's a versatile and well-made piece of studio gear for a great price.


An amazing product for the price

By Bryce Stejskal

from Auburn, CA

Comments about Middle Atlantic VTB-1 Tube Blend Mic Preamp:

I mainly purchased this product for the tube blend feature, looking to warm up my guitar sound using the amplifier that I already own and am very happy with. When I first plugged in, I was not too impressed with that particular feature, although the preamp did do everything it is ment to do flawlessly with no noise until the gain was above 3/4. Having done a little research, I found that I should leave the unit powered on for a few days to let the tube "burn in". After doing so all I can say is wow! The amount of warmth added to the sound is worth every penny. And that is with the stock tube! However, due to the starved plate design of the tube section, changing the tube shouldn't have a very big of an impact on sound, but after reading around on the net it seems that a number of people have had very good results doing so anyways so I plan on trying that very soon. A few people even changed out the op-amps inside with great results as well! Excellent product.

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