Quoted from the site below

"Dallas Range Master", which was produced in small quantities in the 1960s・This is a treble booster.), which has been revived in modern times, is a booster that uses military-spec germanium, and can push a vacuum tube amp with large headroom even at low volumes to overdrive it. . In addition, the original "RANGE" control allows you to create a wide range of sounds as a treble booster or bass booster.

【situation】
Since it is an old one, only the main body, everything in the photo is included.