1 CH Vacuum Tube Mic Pre Channel Strip 676

THE PEDIGREE OF PROFESSIONAL AUDIO.
At dbx Professional Products we are proud to introduce the all new 676 Tube Mic Pre Channel Strip. The 676 represents all of the best of dbx’s more than 40 years of dynamics processing.
The 676 offers a pristine high-voltage, Class-A tube preamp section that runs on 250 volts, so your signal can be as crystal clean or dirty as you need it to be. The 676 also incorporates the compressor/limiter design from the highly-sought after dbx162SL, as well as a 3-band parametric EQ with sweepable mids.
The 676 provides audio professionals with the perfect channel strip for recording and live applications alike with its military-grade build, vintage-inspired controls and VU metering.
Recommended for: Studio.
 

Features

 

Class-A Vacuum Tube Preamp with High Voltage Gain
High-Visibility Vintage VU Meter
Compressor designed from the dbx162SL
3-Band Semi-Parametric EQ
1/4” and XLR Inputs and Outputs
Front Panel Instrument Input
Side Chain Insert

 

Specifications

 

Mic Preamp Connector
Female XLR Pin 2 Hot; Electronically balanced/unbalanced

Mic Preamp Input Impedance
1.9 kΩ

CMRR
>85 dB from 20 Hz to 3 kHz, >70 dB from 3 kHz to 20 kHz

Instrument Input Connector
Tip-Sleeve ¼” Jack

Input Type
(instrument) Unbalanced

Instrument Input Impedance
500 k Ω

Max Input
(instrument) +21dBu unbalanced

Preamp Insert Connector
Tip-Ring-Sleeve ¼”, RF filtered

Preamp Insert Type
Unbalanced, Tip = send, Ring = return

Line Outputs (Preamp & Compressor/Limiter) Connector
Male XLR and Tip-Ring-Sleeve ¼” (Pin 2 and Tip hot)

Line Outputs (Preamp & Compressor/Limiter) Type
Servo-balanced/unbalanced

Line Outputs (Preamp & Compressor/Limiter) Impedance
Balanced 30 Ω, unbalanced 15 Ω

Line Outputs (Preamp & Compressor/Limiter) Maximum Output Level
> +21 dBm (into a 600 ohm load)

Compressor Sidechain Insert Connector
Tip-Ring-Sleeve ¼”, RF filtered

Compressor Sidechain Insert Type
Unbalanced, Ring = output, Tip = input

Compressor Sidechain Insert Impedance
1 kΩ (output), 50 kΩ (input)

Vacuum Tube Type
12AU7A / ECC82

Vacuum Tube Grid Power Supply
+250V DC

Vacuum Tube Heater Power Supply
+12V DC

Frequency Response (Mic Input)
20 Hz to 50 kHz, +0/-1dB, 40 dB gain

Frequency Response (Instrument Input)
30 Hz to 70 kHz, +0/-1dB, unity gain

THD + Noise (Mic In to LIne Out)
0.25% typical at 0 dBu out, 1 kHz, 40 dB gain

THD + Noise (Instrument In to Line Out)
0.2% typical at 0 dBu out, 1kHz, unity gain

Equivalent Noise Level
Typically > -123 dBu with a 150 Ω source load, 22 Hz to 22 kHz

Noise Floor
Mic Insert to Comp Output: <-93 dBu, unity gain, EQ flat and no gain reduction

Preamp Function Switches/Controls: Instrument Input
Selects between microphone XLR input and front panel ¼” instrument input

Preamp Function Switches/Controls: +48V
Sends +48 VDC through 6.81 kΩ resistors to pins 2 and 3 of the microphone input

Preamp Function Switches/Controls: 20dB Pad
Attenuates the microphone input by 20 dB

Preamp Function Switches/Controls: Polarity Invert
Reverses pins 2 and 3 of the microphone input XLR

Preamp Function Switches/Controls: 80 Hz Low Cut
Enables an 80 Hz, 12 dB/octave high pass filter in the microphone and instrument signal path

Preamp Function Switches/Controls: Gain Control Range
-∞ to +55 dB for Microphone Input; -∞ to +40 dB for Instrument Input

Preamp Function Switches/Controls: Post Tube Attenuation
-∞ to 0 dB

Preamp Function Switches/Controls: Peak Indicator
Illuminates RED when the Preamp is within 3 dB of clipping

EQ Low Frequency
100 Hz, Low-pass shelving filter

EQ High Frequency
10 kHz, High-pass shelving filter

EQ Mid Frequency
Sweepable from 100 Hz to 8 kHz

EQ Function Switches/Controls: Narrow
Selects the “Q” of the MID Frequency EQ. “OUT” position Q = 0.9; “IN” position Q = 2.9

EQ Gain
(All Bands) Sweepable from –15 to +15 dB

Compressor Threshold Range
-40 dBu to +20 dBu

Compressor Threshold Characteristic
Selectable OverEasy™ or Hard Knee

Compressor Ratio
Variable 1:1 to ∞:1; 60 dB maximum Compression

Compressor Attack/Release Modes
Selectable Manual or Auto

Compressor Manual Attack Time
Scalable program-dependent; Typically 400 dB/msec to 1 dB/msec

Compressor Manual Release Time
Scalable program-dependent; Typically 4000 dB/sec to 10 dB/sec

Compressor Auto Attack Time
Program-dependent, typically 15 ms for 10 dB, 5 ms for 20 dB, 3 ms for 30 dB

Compressor Auto Release Time
Program-dependent, typically 120 dB/sec

Compressor Output Level Control Range
-20 dB to +20 dB

Compressor Peak Indicator
Illuminates RED when the Compressor/Limiter is within 3 dB of clipping

Limiter Type
dbx PeakPlus™

Limiter Threshold Range
-4 dBu to + 22 dBu (off)

Limiter Ratio
∞:1

Limiter Attack and Release
Program-dependent

Power Supply
Universal switch-mode

Operating Voltage
100 – 240 VAC, 50/60 Hz

Power Requirements
20 Watts

Fuse
T2.5AL 250V

Turn-On Time
Approximately 2 seconds

Dimensions
3.5”H X 19”W X 8”D (88.9mmH X 482.6mmW X 203.2mmD)

Weight
8.1 lbs (3.7 kg)

Shipping Weight
11.0 lbs (5.0 kg)