Urei 1176LN Rev F Compressor (Vintage)
From the beginning the 1176 had used the class-A 1108 preamp for output gain. Rev F replaced this with a push-pull amplifier based on the 1109 preamp. This gives the rev F more output gain and a slightly different sonic character than previous revisions. In spite of this, this revision measures the lowest harmonic distortion of any revision.
Rev F replaced the UA-5002 output transformer with a Bournes B11148 which Revs F and G were also the first to incorporate integrated circuits. First, the rev F switched from a discreet to an opamp-based metering circuit.
- DESIGN DATE: 3/15/73SERIAL NUMBERS: 2611-7052
OUTPUT AMPLIFIER CHANGED TO A PUSH-PULL (CLASS-AB) CONFIGURATION FROM THE ORIGINAL CLASS-A DESIGN
OUTPUT TRANSFORMER IS CHANGED TO THE B11148 TYPE WITH 12 DB OF GAIN (SAME TRANSFORMER AS THE LA-3A)
PUSH-PULL DESIGN PROVIDED MORE OUTPUT DRIVE, AND WAS BASED ON THE 1109 PREAMP
CHANGED THE METERING CIRCUIT TO AN OP-AMP FOLLOWING THE METER FET, INSTEAD OF BALANCED BRIDGE TRANSISTORS