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

K. Kelley

September 15, 2020

Does the Trick!

Sounds great on everything I throw at it! Tons of character and easy to use. Money well spent.

J. López Uribe

September 14, 2020

Lots of colour and glue

It adds beautiful warmth to bass and drums. Great compressors

A. Lawson

September 13, 2020

Big Yezza

Love these things, from old school grit to silky goo..

D. Louisin

September 9, 2020

Essential !!! Exellent !!! Effective !!!

My rating, triple E, for essential, excellent and efficient! I took the 176 mix in parrallel processing on the drum bus and "boom" the big slap in the face! on vocals, guitars, keyboards we enjoy !! Congratulations to the whole team !! tools now essential for working in the box
D. Louisin produce in the

P. Hoier

September 7, 2020

Colorful fast and punchy compression

Well it is really evident, as they say, that the UA 175B/176 collection captures the essense of more 'modern' 1176 compression in a more colorful Fairchild-like rendition. It's got the right amount of punch and smack, with loads of faithful warmth and grit. An interesting aspect by it self, as these qualities seems so well integrated into the overall sound outcome. On an electronic drum-bus it almost feels like modern dancemusic is taken back to the tubey sound of the 50's.

Needless to say, these compressors are done so perfectly right in the wellknown UA manner, that it almost doesn't surprise anymore!

E. Koch

September 5, 2020

serious Wow!!! compressor collection should be without..

i patched these up on a mic > 175B > 176 > vertigo just runing minimal transient shaping brick >ZOH-MAUG-DUDE, speechless really.....the infinitely variable A/R times, combined with the way they react to and so on the sound...and then you can even tweak the texture beyond that.... can also be very subtle tube/trans richness that is very clean and punchy, but so flexible beyond that.

J. Hart

September 4, 2020

My go to plugin

The 175B is a phenomenal limiter

J. Hart

September 4, 2020

My go to plugin

The 175B is a phenomenal limiter

J. Neves

September 3, 2020


These are absolutely awesome! It's what 1176s should really sound like lol. Only joking, they simply sound like a million dollars!

S. May

August 29, 2020


Been at home using it lots trying it on pretty much everything

F. St-Gelais

August 23, 2020

Haven't used a 1176 since

How are THOSE not as legendary as the 1176? They sound better in almost every way! They were probably more expensive to produce so the law of commerce crowned an inferior product just like it did with Beta vs VHS tapes in the 80's. Oh well, who cares now that we have THOSE plugins to play with! Thanks you, UAD!!!!!!!

N. Butler

August 17, 2020

Nobody told me the 1176 was an inferior, solid state version of this!

I purchased the 175B/176 recently, and WOW does it have an incredible sound - and it imparts such a lovely heft and grandness to nearly everything - I've had a love affair with the 1176 for a couple decades, but for some reason never really understood the connection to the 176. I know this is the honeymoon phase, and it's not for everything, but the 175B/176 will definitely be a staple in the majority of my mixes going forward.

A. Eisele

August 17, 2020

Thick, Gluey Compression

What I especially like is that the compression does not very obvious compression artifacts; somehow it is transparent in its compression while adding that tube-driven thick tone. I've been using the UA 176 on instrument busses to glue channels together with thick but subtle compression. Highly recommended for vintage tones with dimensionality and depth.

E. Koch

August 16, 2020

better than the fairchild for most things ( coming back for these later )

compression is so financially painful because there is no one thing with it..
the fairchild was an expensive unit because it had so many stages in trying to be a tube "brick wall limiter" with an expansive knee control...
but if your just dressing up a take, and what to leave a good portion of the dynamics intact, introducing some, but not too much too much, THD convolution, then these are going to be the go to......or if your planning on using the fairchild as your mastering compressor, then you don't want it on individual takes ( the only exception being drums, and volume pot wielded single channel guitar amps )

M. Mchangani

July 31, 2020


Played around vocals and compared it to a chain of 1176 and la 2a...from that point I knew I had to buy this bundle. I just purchased it after trying it for 4 minutes! No regrets!

m. engin

July 20, 2020


Fat Sound!


July 18, 2020

UA 175B & 176 Tube Compressor Collection

The word to define this plugin sound is warmth. Very similar to 1176 but no so heavy.

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.