Dual Vacuum Tube Preamp w/Digital Out

The Silver Series 386 dual channel tube mic preamp puts the best of both worlds into one affordable package by combining the warmth of the irreplaceable vacuum tube with the proprietary dbx® Type IV™ conversion system. The 386 boasts many of the same features as other products in the Silver Series, such as +48V phantom power, a phase invert switch, and low cut filtering; but also includes digital outputs in both AES/EBU, and S/PDIF formats.

The high impedance, 1/4" instrument input located on the front panel, as well as the mic/line switch, and 20 dB pad show our dedication to providing convenience in the studio. The 12 segment LED meters provide a visual indication of analog or digital levels at a glance. The rear panel includes both mic and line inputs and outputs, word clock sync input and output, and digital outputs. Add selectable sampling rates of 44.1 kHz, 48 kHz, 88.2 kHz, or 96 kHz; selectable dithering and noise shaping; and separate analog and digital output controls to this already impressive list of features, and we think you’ll agree that the 386 lives up to the innovative dbx® standards.


·       Two channel tube microphone preamplifier

·       Selectable 96kHz, 88.2kHz, 48kHz, or 44.1kHz sampling rate

·       24, 20, and 16-bit wordlengths

·       Selectable dither and noise shaping

·       AES/EBU and S/PDIF digital outputs

·       Word clock sync input and output

·       Separate analog and digital output control

·       Type IV™ conversion system

·       60dB of gain and +/- 15dB of output gain

·       Selectable mic/line switch

·       48 volt phantom power

·       20dB pad

·       75Hz low cut filter

·       Phase reverse

·       Segment LED analog/digital


Mic Preamp Connector

Female XLR Pin 2 Hot; Electronically balanced/unbalanced

Mic Preamp Input Impedance


Mic Preamp max input level

-9 dBu or +11 dBu with 20 dB pad engaged


>40dB, typically 55dB

Mic Preamp Equivalent Input Noise (EIN)

Typically -120 dBu with a 150Ω source load, 20Hz to 20kHz BW

Input Connectors

(instrument/line) 1/4" Jack

Input Type

(line) Electronically balanced/unbalanced; (instrument) Unbalanced

Max Input

(instrument/line) +21dBu balanced or unbalanced

Gain Adjustment Range

(drive control) Line/Instrument: -15dB to +15dB; Mic: +30dB to +60dB

Output Connectors

Male XLR Pin 2 Hot and TRS 1/4"

Output Type


Output Impedance

Balanced 120Ω, unbalanced 60Ω

Max Output

>+21 dBu, >+20 dBm (into a 600Ω load)

Digital Output Connector


Digital Output Impedance

110Ω for AES/EBU, 75Ω for S/PDIF

Word Sync I/O Connectors


Word Sync Input Impedance

75Ω terminated by internal jumper

Word Sync Input

96, 88.2, 48, or 44.1kHz word clock

Word Sync Output

96, 88.2, 48, or 44.1kHz word clock

Output Level

-15dB to +15dB

Line Switch

Selects between microphone and line inputs

Mic Preamp Phantom Power


Pad Switch

20dB pad

Phase Invert Switch

Reverses pins 2 and 3 of the microphone input XLR

Low cut Switch

75Hz, 12dB/octave high pass filter

Frequency Response

(analog) <10Hz to 75kHz


0.35% typical at +4dBu out, 1kHz, 40 dB gain

Interchannel Crosstalk

Typically –80dB, 20Hz to 20kHz

A/D Converter

dbx® Type IV® A/D Conversion System

Sample Rate

96, 88.2, 48, or 44.1kHz selectable


24, 20, or 16 bit selectable

Dither Type

TPDF, SNR2, or none

Noise Shape

Shape 1, Shape 2, or none

Digital Output


Digital Output Dynamic Range

107dB typical, A-weighted, 22kHz bandwidth

Operating Voltage

DO: 120VAC 60Hz, 100VAC 50/60Hz; EU: 230VAC 50/60Hz

Power Consumption



1.75'' x 7.75'' x 19'' (4.5cm x 19.7cm x 48.5cm)

Unit Weight

6.89 lbs (3.17kg)


0dBu = -16dFS, 0dBu-0.775Vms 

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