QueenMaster Treble Booster is the most vintage of the series, and it’s inspired by the iconic Dallas Rangemaster used by Brian May (and obviously not only) in the early years of his career. Some tricks on the circuit make QueenMaster much more stable than the device it is inspired by, as the active components of the Rangemaster were very sensitive to variations in temperature and humidity. The sound of this treble booster is a milestone, featured in dozens and dozens of recordings in rock history. Gain 32db.