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Retro 176 Limiting Amplifier  From Retro

A replica of the UA 176, this tube-limiting amplifier has all of the familiar character from the original 176 complete with a modern and versatile feature set.

Retro Instruments Inc.


Retail:  $3,695.00

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Manufacturer's Description from Retro


The Retro 176 is based on a Bill Putnam classic, the UA 176. The Retro 176 faithfully reproduces the sound of the 1960s original with new features for the modern recording studio. The Retro 176 provides one of the most desirable compression signatures in recording history. 


The Retro 176 Limiting Amplifier has the largest feature set in any vacuum tube compressor.
  • Authentic variable-mu tube design
  • Precision Knob scales for easy recallability 
  • Continuously variable attack and release time 
  • Four settings of compression ratio from soft compression to limiting (2:1, 4:1, 8:1, 12:1) 
  • Wide-Range Sidechain Highpass Filter 
  • Vocal Asymmetry Tool 
  • Hard-wire Bypass Switch 
  • Interstage Transformer Bypass Switch 
  • High Quality VU Meter switchable between Input, Output and Gain Reduction 
  • XLR input and output connections 
  • IEC power connector 
  • 115/230V AC Mains 
  • Integral tube balance test 
  • Easy stereo strapping of two or more units 
  • Selected NOS tubes and components
Retro Instruments Inc.

About Manufacturer

Retro Instruments was founded by Phil Moore in 2006 to re-introduce classic-quality tube audio products to the professional recording industry. The initial product brought to market was a re-creation of the classic Gates Sta-Level, re-designed by Phil simply because it was his favorite piece of gear and he wanted to recreate it for the modern market. Over the years, Retro has evolved into a company with a diverse and extensive portfolio including re-imagined vintage products that are used by award-winning recording professionals around the world.


  • 20 dB of available gain reduction 
  • Signal to noise ratio of greater than 76dB 
  • Flat frequency response within 0.5dB from 20-20,000Hz
  • Harmonic Distortion of less than 1% from 0-15dB gain reduction