(7 votes, average: 3.86 out of 5)
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2 thoughts on “GE 5-Star 6386 Black Plates Triple Mica”
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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
Coming from the prestigious 5-Star family, my expectations for this tube were high right out of the gate. I am happy to report that it didn’t just meet those lofty standards—it comfortably exceeded them.
The primary characteristic of this tube is its unrivaled transparency. There is absolutely no coloration to the signal; you get a pure, crystalline sound that remains smooth without any artificial “edge” or grain. Because it was originally engineered for high-stakes radio-frequency applications, the frequency response is exceptionally linear. You won’t find any distracting peaks or valleys across the audible spectrum, resulting in a presentation that is both dynamic and incredibly balanced.
Technical Deep Dive: The Remote-Cutoff Legend
The 6386 is a specialized twin-triode that shares the same pinout as the 2C51/5670 family, but it possesses a unique internal architecture. Unlike the standard sharp-cutoff 5670, the 6386 is a remote-cutoff (variable-mu) tube. This means the grid is wound with a variable pitch, allowing the transconductance to change smoothly with bias—a feature that made it the heart of legendary vintage compressors like the Fairchild 670.
Construction-wise, the GE 5-Star variant often features triple mica spacers and black plates, which significantly improve mechanical stability and heat dissipation. These “ruggedized” features minimize microphonics and internal vibrations, explaining why the noise floor is so exceptionally low. While it is a drop-in replacement for the 5670 in many preamps, its ability to handle high-frequency signals with minimal distortion is a direct result of its RF heritage.
Final Verdict
In my experience, this is easily the most natural-sounding 2c51/5670 variant available. If you are looking for a tube that stays true to the source while providing a lifelike, effortless musicality, this GE 5-Star is the gold standard.
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