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Jonathan Horsley

NAMM 2025: “Increase and decrease voltage with volt by volt precision”: AmpRx launches Brownie – a voltage optimising power supply to make your tube amp perform at its best (and maybe help you finally nail Eddie Van Halen’s ‘Brown Sound’)

Eddie Van Halen Marshall

AmpRx Brownie – a brown unit with a gold dial, LED display, and yellow text.

NAMM 2025: AmpRx has unveiled Brownie, an voltage optimising power supply that’s designed to give your tube amp exactly what it needs to perform at its best.

Now, AmpRx has made voltage attenuators for tube amps before. Its Brown Box series offered an over-the-counter remedy for those looking for Eddie Van Halen’s ‘Brown Sound’, the chance to dial in their own Variac-reduced voltage, run their Marshall head on 10, and apply an MXR Phase 90 to taste.

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