The Studio Projects VTB1 is a single-channel microphone preamplifier, known for its hybrid design and versatility in home and project studios

Description

The VTB1 features a discrete Class A/B solid-state input circuit combined with a variable "Tube Blend" control. The Tube Blend knob lets you continuously sweep between a clean, transparent solid-state signal (fully counter-clockwise) and a warm, saturated vacuum tube sound powered by an internal 12AX7 tube (fully clockwise). It can be used on vocals and acoustic instruments or as a Hi-Z Instrument DI box for electric bass and guitar. It is in Very good condition. Used only in Home studio environment. Tube is working perfectly and sounds warm.

Includes Power Supply, Manual, and Connection Diagrams.

Key Features

Tube Blend Control: Variable drive feeding a 12AX7 tube to dial in anything from clean solid-state to heavy tube saturation.

Switchable Impedance: Dual-impedance selector (50 Ω / 200 Ω) to match ribbon, dynamic, and condenser microphones.

Front-Panel Hi-Z DI: Instrument input for direct recording of guitars, basses, and keyboards.

TRS Insert Jack: Dedicated send/return point between the solid-state and tube stages for external gear like compressors or EQs.

Essential Controls: +48V phantom power, phase reverse, 75 Hz high-pass filter (-18dB/octave), mic/line level switch, and a 5-segment LED meter.

Preamp Type: Hybrid Discrete Class A/B Solid-State + 12AX7 Tube Stage

Channels: 1