Studio Projects VTB1 Variable Tube Microphone Pre Amplifier


Tube Microphone preamp.

What we think:

The least expensive preamp that we have available (and probably ever will offer). We honestly couldn't beleive the performance this little preamp gave us... While no Avalon 737, this little VTB-1 is a great little solution for someone looking to get into a step above their sound card or mixers preamps, or someone who simply needs a decent phantom power preamp solution for a condenser mic.

Manufacturer Description:

The new Studio Projects VTB-1 is the ultimate in low cost mic preamplifier technology. Incorporating true class A/B switching, the VTB-1 is a totally discrete circuit. Unique to the VTB-1 is the "Tube Drive". The Tube Drive is a variable drive to a 12AX7, that allows the user to blend as little, or as much of the Tube Drive they want. This VTB-1 allows the user the most flexibility of any mic preamplifier in it's price class.

The VTB-1 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 VTB-1 is must have device as the perfect mic preamplifier for any microphone!


  • 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
  • Output Gain Control On Detented Pot


  • A superb vocal mic pre with warm transparent character
  • Great for use as a Tube DI Box
  • Great for production, broadcast, and voice over work
  • Perfect for the professional and home project studio
  • A quality vocal mic preamplifier suitable for all vocal styles

Year Condition
Call Brand New


Sound Pure
Durham, NC
3:48 AM
10am-6pm EST Monday-Friday and 11am-5pm Saturday