Universal Audio 1176LN User's Guide Page 1

Model 1176LNSolid-State Limiting AmplifierUniversal Audio, Inc.www.uaudio.comPO Box 3818Santa Cruz CA 95063-3818

6procedure to calibrate the 1176 stereo adapter:! Remove the signals from both 1176 units! Disable the gain reduction on each limiter (rotate both ATT

7Theory of OperationInputGRCircuitPre-Amp Output AmpGR ControlCircuitSignalInputSignalOutputFigure 1 - Block Diagram of the 1176LN.OverviewFigure 1 sh

8Figure 2 – 1176 Input Section1176 LN Input SectionThe 1176LN Input Section is comprised of an adjustable passive attenuator followed by atransformer.

9will result in a higher voltage from the Gain Control Circuit, which will lower the gain,hence reducing the signal level. This is the basis of the l

10From Pre-Ampoutput"Q" Bias Adj.P.C.B.4:1 8:1 12:120:14:18:112:120:1Attack TimeControl(F.P.)Release TimeControlTo GR Circuit

11by regulating how fast C22 is charged. Likewise, R56 determines the compressors releasetime by controlling the rate at which C22 discharges. The o

12HistoryIt was Bill Putnam himself who, in 1966, was responsible for the initial design of the 1176.Its circuit was rooted in the 1108 preamplifier w

13“The 1176 absolutely adds a bright character to a sound, and you can set the attack soit's got a nice bite to it. I usually use them on four to

14also known for his work with Red Hot Chili Peppers, Natalie Merchant and Wilco. “I use1176s real conservatively and they still do amazing things,” h

iiUniversal Audio 1176LNThank you for purchasing this reproduction of the classic 1176LN compressor. When myfather designed this product, he was very

iii1176LN User’s GuideUniversal Audio, Inc.PO Box 3818Santa Cruz, CA 95063-3818(831) 454-0630 voice(831) 454-0689 faxwww.uaudio.comUniversal Audio

ivUNIVERSAL AUDIO 1176LN ...II1176LN SPECIFICATIONS...

11176LN Specifications! Input Impedance: 600 Ω, bridged-T control (floating)! Output Load Impedance: 600 Ω (floating)! External Connections: XLR Con

2InstallationRear Panel ConnectionsBoth XLR style connectors as well as the original terminal strip are provided for both inputand output connections.

31176 LN OperationMeter Function / On-Off Pushbutton SwitchesThe pushbutton switches located to the right of the meter are used to determine themeteri

4compression is disabled. The Attack Control potentiometer allows for an adjustableresponse time of 20-800 microseconds. The fastest attack time is

5CalibrationNote: There are no user serviceable parts inside theUniversal Audio 1176LN. Unit calibration as well as repairshould only be performed on