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1176 Peak Limiter

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The 1176LN Peak Limiter is a compressor introduced by UREI in 1967. The 1176LN was inducted into the TECnology Hall of Fame in 2008. At the time of its introduction, it was the first true peak limiter with all solid-state circuitry.

Contents

Uses

  • It uses a FET for gain reduction, in a feedback configuration.
  • Four different compression ratios are available 4:1, 8:1, 12:1, and, 20:1
  • Attack time is adjustable from less than 20 microseconds to 800 microseconds
  • Release times are adjustable from 50 ms to 1100 ms (1.1 seconds)
  • Two units can be linked for proper stereo operation (not just dual mono)
  • Revisions

    The 1176 underwent a number of revisions including the addition of Brad Plunkett's low-noise (LN) circuitry to produce the 1176LN. This reduced the noise by 6 dB and redistributed the noise spectrum, producing even more noise reduction in the sensitive mid-range. Revisions D and E are reputed to sound the best.

  • Revision A was the original (1967/6/20) design by Bill Putnam, it had a brushed aluminium face, blue paint and red power light. Serial numbers 011-125
  • Revision AB improved stability and noise. (1967/11/20) Serial numbers 126-216
  • Revision B incorporated changes to transistors. Serial numbers 217-1078
  • Revision C, the 1176 LN, added low-noise circuits on additional circuit boards and reduced distortion and changed the faceplate to black. (1970/1/9) Serial numbers 1079-1238
  • Revision D has no circuit changes, but the additional low-noise circuitry was incorporated into a new main circuit board. Serial numbers 1239-2331
  • Revision E has a new power transformer that is now switchable between 110 V and 220 V. Serial numbers 2332-2611
  • Revision F changed the output amplifier from a class A to a push-pull design. Metering circuit now uses an op-amp (1973/3/15) Serial numbers 2612-7052
  • Revision G replaced the input transformer with a differential amplifier. Serial numbers 7053-7651
  • Revision H changed the faceplate to silver and includes a red “Off’ button. This version is branded with blue UREI logo. Serial numbers 7652-
  • Universal Audio Re-Issue (2000/4/1) is based on “D” and “E” models.
  • All Button Mode

    It was common to use the 1176 in 'all-button mode' or 'British mode'. This was when all four of the ratio buttons are pressed simultaneously.

    "The way the 1176 sounds, and specifically, the way All-Button mode sounds, is partially due to its being a program dependent compressor. The attack and release are program dependent, as is the ratio.

    The 1176 will faithfully compress or limit at the selected ratio for transients, but the ratio will always increase a bit after the transient. To what degree is once again material dependent. This is true for any of the 1176’s ratio settings, and is part of the 1176’s sound.

    Reputation

    Mike Shipley says “The 1176 absolutely adds a bright character to a sound, and you can set the attack so it's got a nice bite to it. I usually use them on four to one, with quite a lot of gain reduction. I like how variable the attack and release is; there's a sound on the attack and release which I don't think you can get with any other compressor. I listen for how it affects the vocal, and depending on the song I set the attack or release—faster attack if I want a bit more bite. My preference is for the black face model, the 4000 series—I think the top end is especially clean.”

    Jim Scott says “They have an equalizer kind of effect, adding a coloration that's bright and clear. Not only do they give you a little more impact from the compression, they also sort of clear things up; maybe a little bottom end gets squeezed out or maybe they are just sort of excitingly solid state or whatever they are. The big thing for me is the clarity, and the improvement in the top end.”

    References

    1176 Peak Limiter Wikipedia


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