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Watch Classic King restore a Fairchild 670. What’s a Fairchild 670? Right here’s extra from Common Audio WebZine:
…the stereo Fairchild 670 might be the “Holy Grail” of compressors in studio gear esoterica, not solely due to its value however its excessive rareness and the difficulties in sustaining such a chunk. The 670 can get fetch $30,000 and past on the classic market. With its 14 transformers, 20 vacuum tubes, and 6 rack-space encompassing girth, the Fairchild 670 is the heavyweight champion of compression, weighing in at 65 lbs.
Originating from the early 1950’s, the design of the 670 makes use of a single push-pull stage of amplification with an especially excessive management voltage. The Fairchild 670 is a variable-mu tube limiter. Variable-mu limiters are distinctive in that they use tubes for acquire discount, and never simply as amplifiers. The audio path is sort of easy, and compression occurs instantly within the audio path, fairly than sending out to a separate compression circuit.
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