The VT-3 from D.W. Fearn is a dual-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" phone jack output. Tube circuitry provides the very high impedance necessary to capture all the details of these instruments.
The outputs of the VT-3 are mic level (150 ohm source impedance at a nominal -30dBV). The VT-3 Direct Box is designed to operate into a high-quality microphone preamplifier like the Fearn VT-1 (#180271) and VT-2 (#180272) Vacuum Tube Microphone Preamplifiers.
Operation is very simple: plug the instrument into the 1/4" front panel jack and take the output either from the front panel XLR connector, or a parallel XLR connector on the back panel. A second 1/4" jack provides an output to feed a guitar amplifier when necessary. A ground-lift switch helps eliminate ground loop buzz, and a switchable high-pass filter gently rolls off frequencies below 100Hz when required.
The two channels are entirely independent and can be used with two different instruments at the same time.
-All-Triode Vacuum Tube DI
-Two Independent Channels
-Provides The Proper Load Impedance For All Instruments That Have A 1/4-Inch Phone Jack Output
-Ground-Lift Switch Helps Eliminate Ground Loop Buzz
-Switchable High-Pass Filter Gently Rolls Off Frequencies Below 100Hz
-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 @ 20 cps
-Crosstalk maximum: -90 dB @ 20 kc
-Power Requirements: 100/120/220 VAC 50/60Hz 25W
-Dimensions: 19"W x 5.25"H x 10"D, (48.3cm x 13.3cm x 25.4cm)
-Weight: 10 lbs (6.82 kg)