The company Dallas Arbiter known to have made the famous Fuzz Face released in 1968 the Treble Plus Bass Face. This effect is a booster with three adjustment potentiometers. One for the treble, one for the bass and the last one to adjust the volume. Originally, the circuit was mounted in the same enclosure as the Fuzz Face found in several colors (red, black, gray).
The transistors used are BC109 grade "C" which give a very high gain.
This an effective booster that brings out the character of the pickups of your guitar.