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The AmpRX BrownBox 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. AmpRX products can also be used with modern solid-state amp designs protecting them from potential overvoltage conditions. 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 creating a signature tone. Most vintage tube amps respond more harmonically and touch-sensitive with optimized voltage. Placing these circuits back into balance reveals the authentic tone fundamental of the amp tone that can truly blossom. For the Tube Tone Purist no pedal or attenuator can come close to replicating the heavenly response of dry purely saturated tubes. Pedals and attenuators have their place keeping in mind that they color your tone not create it. Everyone can enjoy multi-dimensional pure tube tone if they just know where to start. BrownBox is not a variac. Unlike a variac Brownbox cannot accidentally harm or destroy your amplifier. The maximum input voltage available using BrownBox is your regional line wall voltage in bypass mode. All other selections are reduction levels that you determine sound best for your amp. BrownBox employs a proprietary custom-wound toroid transformer intended for use with one amplifier. Check your amp’s input wattage rating prior to use. AmpRX proprietary transformers are custom wound exclusively for use with tube amplifier designs but can and should be used with solid-state circuits.