Hazelrigg Industries VDI Single Channel Tube Direct Box  From DW Fearn

The VDI is a single-channel, all-triode vacuum tube DI (“direct box”) for recording electric or electronic instruments. The inputs are designed to provide the proper load impedance for all instruments that have a 1/4-inch phone jack output. Tube circuitry provides the very high impedance necessary to capture all the details of these instruments.

DW Fearn


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Manufacturer's Description from DW Fearn

A reimagining of the legendary D.W. Fearn VT-1/F, the VDI is an all-triode Vacuum Tube Direct Box in a single channel configuration. Unlike the original VT-I/F dual channel design, the VDI is a single channel offering housed in a robust, low profile steel chassis, ready to slip into a backpack or gig bag. Designed for both stage and studio work, the VDI is offered as part of the Hazelrigg Industries Solutions Series by D.W. Fearn and will deliver incredible results with amplified acoustic instruments, electric bass and guitar, synths or more.


The operation is simple as can be. The front panel includes a 1/4” Instrument Input jack as well as a 1/4” Thru connector to pass the signal on to a guitar or bass amplifier if desired. The mic level output signal is available on an XLR Connector, ready to be patched to a premium Microphone Preamp such as the D.W. Fearn VT-1, VT-2, VT-24 or Hazelrigg Industries VLC. Finally a Ground Lift option is provided to address Ground Loop issues should they arise. The more utilitarian rear panel features an IEC Mains Socket, Power Switch and 115V-220V Mains Selector.


Sharing the same high-headroom circuit design as the venerable VT-I/F, the VDI will provide stunningly dynamic results on electric bass and guitar, add power and girth to vintage (or modern!) synths and bring a depth and realism to piezo equipped acoustic instruments outfitted that simply must be heard.



 ◆ Direct Injection Circuit Designed by D.W. Fearn

 ◆ Front Panel Instrument Input on 1/4” Jack

 ◆ Front Panel Pass-through Output on 1/4” Jack

 ◆ Front Panel Microphone Level Output (150 ohm source impedance at a nominal -30dBV)

on XLR Connector

 ◆ Ground Loop Switch

 ◆ All Steel Chassis

 ◆ 5 Year Warranty (90 days for vacuum tubes)

 ◆ Hand Crafted in the USA


DW Fearn

About Manufacturer

D.W. Fearn manufactures professional vacuum tube audio equipment. Our microphone preamplifiers and equalizers are in daily use around the globe, in personal studios as well as in the world's top recording studios.


(with 200 mV input)

Input: 200 mV nominal unbalanced

Input Load Impedance: 1 megohm minimum

Minimum Input Level: 5 mV nominal

Maximum Input Level: 2.3 volts P-P for 1% THD

Gain: -10 dB

Frequency Response: +/- 0.2 dB 10 cps to 20 kc

-3 dB @ 0.5 cps and 95 kc

THD + Noise: <0.3% 20 cps to 20 kc

Intermodulation Distortion: <0.01% SMPTE

Noise: minimum 90 dB below output   (22 cps to 22 kc bandwidth)

Output: Transformer Balanced  (matches 150 ohm input)

Output Level: -30 dBm nominal

Maximum Output Level: -12 dBm

Power Requirements: 120/220 VAC 50/60Hz 25W

Dimensions: 6.25”W x 2.25”H x 9.5”D  (15.9cm x 5.7cm x 24.2cm)

Weight: 6 lbs. (2.73kg)

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