AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Leblanc Denis Wick practice mutes are

Denis Wick practice mutes are perhaps the best teaching aid ever invented

L/R RCA Line inputs

On top of the classic Mono mode

The world's most popular Bb clarinet mouthpiece

or your instrument's tuning pegs

AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Leblanc Denis Wick practice mutes areBrownBox was created to provide a safe range of voltage reduction levels for vintage tube amplifier designs. The same, era correct voltage levels that the amps were designed around. The dynamics of a vintage amp supplied with the proper line voltage are optimized and will sound and respond as originally intended, revealing the circuits true harmonic content. This is the starting point, the basis of the signal chain, and where serious musicians begin