īill Putnam sold UREI in 1985 and Revision H was the last series produced by the original company. It was renamed to 1176LN and the face color changed to the now familiar solid black. Revision C, designed in 1970, saw one of the major design evolution, with less noise and harmonic distortion. The initial units (A and AB revisions) were available in 1967 and were informally referred as "blue stripe" for their blue-colored meter section. After successfully adapting the 108 tube microphone preamplifier into the new FET-based 1108, he redesigned the 175 and 176 variable-mu tube compressors into the new 1176 compressor. In 1966, Bill Putnam, engineer and founder of Universal Audio, began to employ the recently invented field-effect transistors (FET), replacing vacuum tubes in his equipment designs. One of 1176 predecessors, UA 175 Limiting Amplifier
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