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: 3/15/73
Serial 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