UA 1176LN

Key specs:

About

The 1176 was Bill Putnam Sr.'s answer to a problem the LA-2A couldn't solve: speed. Where the LA-2A's optical design is inherently a little slow to react, useful for smoothing a performance but not for catching a sharp transient, Putnam wanted something that could grab a fast peak almost instantly. His solution, released in 1967, replaced the LA-2A's photocell with a field-effect transistor (FET) controlling gain reduction electronically, which let the 1176 hit attack times as fast as 20 microseconds, a full three orders of magnitude quicker than the LA-2A's fixed ~10 milliseconds. That speed is still the 1176's defining trait: it can catch and control a transient other compressors simply let through.

Unlike most compressors, the 1176 has no threshold knob at all. Instead, engineers drive the Input control until enough signal crosses the compressor's fixed internal threshold to trigger the amount of gain reduction they want, then use the Output control to bring the level back up to where they need it. This input/output-driven workflow, rather than a threshold-and-ratio approach, is part of why the 1176 rewards experimentation: pushing the input harder doesn't just increase compression, it changes the character of the sound passing through it.

That character is most famous in a setting the original manual never mentioned: pressing all four ratio buttons in at once. Officially, only one ratio button is meant to be engaged at a time. Engineers discovered that pressing all four together, "All Buttons In," pushes the circuit into a genuinely different, non-linear mode: distortion increases, the compression curve flattens out, and the response to transients develops a distinctive lag. Rather than being treated as a malfunction, this became one of the most recognizable sounds in the compressor's arsenal, prized on drum room mics, distorted bass, and aggressive vocal effects, a genuine case of engineers finding the most useful setting by deliberately breaking the rules.*

Like the LA-2A, the original 1176 went through numerous circuit revisions over its production run (commonly labeled Rev A through Rev G/H), with the earliest "Bluestripe" units and later "Blackface" D and E revisions particularly prized by collectors. Universal Audio, re-founded by Bill Putnam's sons Bill Jr. and James in 2000, made the 1176LN their second reissue after the LA-2A, modeling it primarily on the Blackface D and E circuits and hand-building it with a custom output transformer built to Putnam's original design.

Notable for: Alongside the LA-2A, one of the two most emulated compressors in audio history, and the compressor most associated with fast, aggressive, characterful compression rather than subtle leveling. Used extensively across decades of hit records, from Led Zeppelin and the Rolling Stones to Michael Jackson's vocals (engineer Bruce Swedien used one on every Michael Jackson vocal take).

Applications

Examples: Lead and backing vocals, drum room and overhead mics, bass guitar, electric guitar, and parallel ("New York style") compression on drum busses or full mixes.

Vocals are a common destination, though the 1176 takes a very different approach from the LA-2A's smooth leveling: its speed lets it grab and control sibilance, plosives, and dynamic peaks that a slower compressor would let through, giving vocals a forward, present, sometimes aggressive quality. Engineers looking for character and up-front energy, rather than the LA-2A's gentle evenness, often reach for the 1176 first.

On drums, the 1176 is a genuine workhorse, particularly on room mics and overheads, where its speed and "All Buttons In" mode can add explosive energy and punch that's difficult to achieve any other way. It's equally effective as a fast, controlled compressor on individual drum elements like snare, adding snap and attack without over-smoothing the hit.

Bass guitar and electric guitar both benefit from the 1176's speed for controlling picking dynamics and adding sustain, and pushing the input hard enough to engage heavier compression is a common way to add grit and character rather than just control level.

As a parallel compression tool, often called "New York compression," the 1176 is a classic choice: blending a heavily compressed, aggressively squeezed signal (sometimes even in All Buttons In mode) underneath the uncompressed original adds density, punch, and perceived loudness to drum busses or full mixes without losing the original transient definition.

* Glossary - In plain terms: 

• "All Buttons In" works because the 1176's ratio buttons aren't simple switches choosing between four separate circuits, they're combined electronically. Engaging more than one at once creates a compression behavior none of the individual ratios can produce on their own: harder, more colored, and less predictable, which is exactly why it became a deliberate creative tool rather than staying a quirk to avoid.