VTB-1 Tube Blend Mic Preamp

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VTB-1 Tube Blend Mic Preamp

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Single-channel mic preamp with Tube Drive.

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.

Features

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

Choose your sound with this versatile mic preamp, order today.

VTB-1 Tube Blend Mic Preamp Specifications:

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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