UA 175B & 176 Tube Compressor Collection

UA 175B & 176 Tube Compressor Collection


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The Bill Putnam-designed tube compressors that changed recording.

Introduced in the early 1960s, Universal Audio's 175B and 176 compressors were the first audio compressors purpose-built for studio recording and mixing music. Often cited among the crowning achievements of audio pioneer and UA founder Bill Putnam Sr., the 175B and 176 are prized for their rich tube gain reduction character, fast attack, and sonic flexibility.

With only roughly 1,000 units made, vintage 175B and 176s easily command well over $5,000 on the vintage market today, and they can be found in the racks of some of the world's finest studios. Now, you can track and mix with the only authentic plug-in emulation of the original UA 175B and 176 compressors — exclusively for UAD hardware and UA Audio Interfaces.

Now You Can:

Track and mix with the only authentic emulations of Bill Putnam Sr.'s most coveted compressor designs

Add vintage tube gain reduction character and detail to vocals, drums, guitars, and more

Spice up any source with harmonically rich tube amplifier and transformer emulation

Creatively control or enhance the dynamics of your most important sources with 2:1, 4:1, 8:1 and 12:1 ratio controls

Harness plug-in-only features like Dry/Wet Mix parallel processing and Headroom for user‑customizable operating level

Mix with artist presets from Jacquire King (Kings of Leon, Tom Waits), Carl Glanville (U2, Bruce Springsteen), Joe Chiccarelli (My Morning Jacket, Beck), and more

Take a Listen

Take a Listen
A Pioneering Limiter

A Pioneering Limiter

With its breakthrough fast attack time and independently variable Attack and Release controls, the UA 175B and 176 went far beyond all previously available broadcast limiters. They were quickly installed in the early 1960's at both United/Western and legendary Sunset Sound studios, where a rack of 176s still reside today. As an all-tube predecessor to the famed 1176, the 175B and 176 compressors have lent warmth and character to thousands of seminal recordings — from the Rolling Stones and Elton John, to Led Zeppelin, Van Halen, Aretha Franklin, and Miles Davis.

Emulating a Masterpiece

Emulating a Masterpiece

Based on a pair of UA's 1960s golden units, the UA 175B and 176 Tube Compressor Collection plug-ins expertly capture Putnam’s tube-based gain reduction designs, as well as the tube amplifier's ultra-musical harmonics and rich, low-frequency transformer saturation. Putnam’s feedback compression circuit is key to the 175B/176 mojo, yielding softer compression at lower input levels and harder, nearly brickwall limiting at higher levels.

All-Around Champ

All-Around Champ

Sonically, the 175B and 176 compressors are often compared favorably to a Fairchild compressor, albeit with more versatile controls. As such, they're perfect for vocals, drums, guitars, and more. The UA 175B and 176 Tube Compressor Collection plug-ins give you all the character and juice of the originals — indistinguishable from the target hardware in blind listening tests.

In Action

In Action

Delicate when you need subtle control, but colorful when slammed, these plug-ins can add depth to room mics or a drum bus, give your guitars definition, park a bass in a mix, and inject vocals with energy. You can even turn off the compression completely and use the 175B/176 plug-ins as a "tone box," lending rich tube amplifier and transformer textures galore.

Key Features

Painstaking circuit emulation of Bill Putnam Sr.'s rare and iconic 175B and 176 tube compressors

Models the entire circuit path and control set of the original hardware units

UA 175B features a fixed 12:1 Ratio, 176 features four selectable Ratios: 2:1, 4:1, 8:1 and 12:1

Exclusive plug-in features include Sidechain Link, Dry/Wet Mix parallel processing and Headroom for user-customizable operating level

Includes artist presets from Jacquire King (Kings of Leon, Tom Waits), Carl Glanville (U2, Bruce Springsteen), Joe Chiccarelli (My Morning Jacket, Beck), and more

Requires a UAD-2 DSP Accelerator or UA Audio Interface, available from authorized dealers worldwide

Customer Reviews

UA 175B & 176 Tube Compressor Collection

Overall Rating

I. Sisko

June 22, 2020

Just Rocks

They work great on almost everything. Still getting used to it, but I love the sound.

Z. Swartz

June 18, 2020


I really made friends with the 176. To me it has the aggressiveness of an 1176, only creamier and warmer. So far I've used it on vocals, bass and snares and it really does it for me. Highly recommend!

Š. Kominko

June 13, 2020

Absolute top.

This compressor adds character and warmth. It's a gem in my sound arsenal. Top work for Universal Audio. Well thank you.

j. mckinley

June 12, 2020


This compressor is great on bass , kick ,snare and vocals .
Nice GUI and controls content excellent

K. Armstrong

June 12, 2020

My new favorite compressors.

Kind of like a combo of the ballistics of an 1176 with the tone of an LA-2 or LA-3. They have sounded sick on all guitars, bass and vocals so far. It would be great if the two models were on a toggle like the CLA-76 Bluey/Blacky thing.

R. Daniel

June 6, 2020

A must have!!!

I’ve been wanting one of these in hardware unit for for years... Thank you UAudio for doing a great job.

R. Marant

June 3, 2020


No había probado estos compresores, porque pensaba que ya tengo bastantes; pero los utilicé para ver qué tal quedaban en la grabación de una voz y una guitarra acústica y me quedé sorprendido de lo bien que sonaba.
Cada vez estoy más sorprendido con los plugins de UAD.

A. Levy

May 23, 2020

My Favorite Compressor

This blows me away every time I try it on anything. I just love it! It makes me happy :D

B. Young

May 19, 2020

Sublime Compressors Especially For Lead Vox

I was and still am a big fan of UA’s TubeTech CL1B MKII compressor for lead vocals but for my latest single there was some warmth and character missing from the lead vox and I couldn’t find what I was looking for. I had been receiving UA ads and updates about the 176’s but just thought ‘oh yeah just another compressor, I have so many of them already’ but I decided to demo them and was instantly blown away. They seemed to combine the best of the LA2A and the Manley Variable Mu - loads of taming ability with loads of tube warmth. It was exactly what my lead vox needed. It’s no exaggeration to say that the UA 176 (the black one is the one I ended up using - both are amazing though) helped make my latest track what it is. You can really control the tone of whatever instrument it is you’re compressing. I happen to think they’re ideal for vocals. I tracked them in LUNA using UA Neve 1073’s / Unison and had the 176 on an insert so I could adjust the comp after tracking. This combo was dynamite. Try it!

智. 竹内

May 10, 2020

One of my favorite

Smooth, Warm, and Fat Sound!!!!!!

S. Whitfield

May 7, 2020

Love it!

Sounds killer!!

B. Senter

April 30, 2020


Sounds great on various instruments!

A. Reverberi

April 1, 2020

Pleasantly Surprised

I never used the Hardware version of these and I was not expecting much beside another 1176 type of compressor, but no they do have their own character, and i do use em white a bit.

p. albert

March 28, 2020

UA 175B ET 176 Tube Compresseur

Compresseur très efficace obtenue avec l'achat d'un satellite DSP .

O. Daniel

March 28, 2020


This works well for me, esp on the 2bus. Just glad to have it.

B. Horvat

March 19, 2020

Great plugins

I hate those plugins. I use to know my way around, when it came to mixing, but with these two units... They're fantastic. Why do I hate them...? Because I'm spending too much time applying them (both versions) to pretty much every track in my mix and spending hours enjoying in what they do, instead of getting my work done. But really, these are my new go to plugins for almost any track. Great character easy to use and they feel like home on my 2bus as well. Good job UAD.

M. Hall

March 4, 2020



J. Eddington

March 3, 2020

Soo Warm

Love the 175B on vocals and keys, and just about everything else.

C. Davies

February 27, 2020

175b and 176

Gives a really warm vibe to the sound of the strat
digging these plugins

J. Barillaro

February 24, 2020


Can't go wrong once you get it set.