![Vintage Guitar Magazine](https://i0.wp.com/www.mu-tron.com/wp-content/uploads/2018/03/VGLOGO_GOLD_1.png?resize=500%2C108&ssl=1)
![25 Most Valuable Effects](https://i0.wp.com/www.mu-tron.com/wp-content/uploads/2018/03/25TOPEFFECTS-WEB-720.jpg?resize=720%2C292&ssl=1)
By Dave Hunter
Vintage Guitar is marking 25 years of publication with a year full of features. This month, using data compiled for The Official Vintage Guitar Price Guide 2011, we continue the celebration with a list of the 25 most valuable effects.
11. 1974-’77 Mu-Tron Bi-Phase (with optical pedal)
($1,000 to $1,250)
This variable-resistor-based phaser offered extensive control functions, and yielded a deep, lush tone. Whether used on automatic or controlled manually via an external optical pedal, its dual sections (A and B) could be set independently or blended to create a tone few phasers have approached since.
![MUTRON BIPHASE](https://i0.wp.com/www.mu-tron.com/wp-content/uploads/2018/03/11-EH-MUTRON.jpg?resize=400%2C237&ssl=1)
12. ’77 Mu-Tron Flanger
($1,000 to $1,250)
Another great, spacey effect from a company whose quality seemed a cut above so many pedal makers. And what happened to Mu-Tron? The company died a slow, agonizing death in its efforts to market the Gizmotron automated guitar “bowing” device, invented by Lol Creme and Kevin Godley of 10cc. I’m not in love…
![MUTRON FLANGER](https://i0.wp.com/www.mu-tron.com/wp-content/uploads/2018/03/12-MUTRON.jpg?resize=400%2C237&ssl=1)
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