![]() ![]() For light compression, say 6 dB or less, the 5670 mimicked the 6386 convincingly. When audio-grade 6386 tubes became harder to source, Manley implemented a new design using a 5670 tube. Released in 1994, the original Variable Mu used a single GE 6386 input tube per channel, the same as in Fairchild and Gates models. ![]() The best description I've ever heard comes from engineer Sean McDonald in his opinion, the Variable Mu "makes everything better, just like a big hug from mom." The unit imparts a thick, warm, almost syrupy sound to anything it processes. As the bias changes, so does the gain control, resulting in a smooth compression profile, with a sound that is augmented by tube and transformer harmonics. In simplistic terms, the input tube is constantly re-biased by the tube-rectified side-chain control voltage. ("Variable Mu" is even a registered trademark of Manley.) Inspired by the famous tube limiters from Fairchild and Gates, the Variable Mu employs a "remote cut-off" compression scheme. The Variable Mu Limiter Compressor from Manley Laboratories has been an industry standard for decades. ![]()
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