Dbx 676 Class A Vacuum Tube Microphone Pre Amplifier Channel Strip 250 Volts

Dbx 676 Class A Vacuum Tube Microphone Pre Amplifier Channel Strip 250 Volts

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.

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)

Echotone Music LLC is an experienced E-commerce Audio Visual Equipment dealer since 1998.  We take pride in selling Pro Audio gear for musicians, sound engineers, production companies and broadcast applications.   

Shipping --Pro packed & shipped  USPS, UPS or Freight Service. Contact us & pay for 2 day air upgrade on any unit. We are working hard to get your product ( built if needed), processed &  shipped. Processing times vary, 2-30  days

Returns/Refunds- If there is truly a manufacturing defect a return tag will be provided. Otherwise customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned with out all its original packaging, & accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. 

What products can not be returned? - Clearance items, Custom Builds, items identified as non-returnable, discontinued items, used or NOS items,  electronic software downloads, demo gear, computers, vacuum tubes, earbuds, harmonicas raw-frame speakers, drumheads, drumsticks, turntable cartridges, fog fluids