The Dallas Rangemaster Guitar Treble Booster!
This small grayish gear box pretty much defined British Rock and Roll of that era and was used by Eric Clapton during his stint with the Bluesbreakers. Later devotees of the Rangemaster included Rory Gallagagher, Toni Iommi, and most notably, Brian May of Queen. The Rangemaster wasn’t actually a stomp box at all, but was originally intended to sit on top of an amp and act as the amps front end. One knob handles loudness while a slide switch bypasses or engages the effect. What the Rangemaster does is add a bit of high-end punch and presence to your sound. With a healthy 10db of boost, this device has no problem pushing the front end of your amp with a sweet crunchy overdrive.