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The Studio Projects VTB1 is a compact half-rack tube mic preamp with a solid-state front end feeding into a blendable tube stage. It handles mics, line, and instrument signals via front-panel Hi-Z TRS input, with switchable 48V phantom, phase reverse, and a 75Hz high-pass filter at -18dB/oct. The key feature is the tube blend knob, letting you mix clean solid-state signal with tube warmth from the 12AX7 without changing levels. TRS insert sits between the SS pre and tube/output for parallel processingGÇöone clean send from insert return, tube-colored main outs.

Meter switches between input and output with five LEDs. Mic input has rear switch for 300 ohm or 2000 ohm impedance to match mics better. Solid gain staging: up to 72dB mic to balanced out, 42dB line. Runs off external 12V AC wall wart. Great as a character pre or DI for bass/guitar, adds harmonics without mud.

Outputs simultaneous balanced XLR and TRS line. Transformerless Class AB design keeps it clean when blended fully SS, with EIN -128dBu at 60dB gain. Frequency response stays flat 20-20kHz within 0.25dB mic path.

Specifications

• Dimensions: 8.5 x 1.5 x 5 in
• Power: 12V AC external adapter
• Max gain: 72dB mic in to bal out, 42dB line in to bal out
• Mic EIN: -128dBu (150 ohm source, 60dB gain)
• Hi-pass filter: 75Hz, 3-pole -18dB/oct
• Tube: 12AX7

Condition

This item has been tested and is in good working condition. It comes with the original packaging. It has no Velcro on the back. Power supply included.