Amp Rx BrownBox Input Voltage Attenuator for Tube amps - $325 (portland)

Like new condition.
Voltage attenuator, BrownBox by AmpRX comes with original box/packaging.
I was surprised how much even a 5 volt difference mellowed the highs and smoothed breakup in my Princeton.
From AmpRX - The tone and performance of both vintage and modern amplifiers rely heavily on the input voltage powering them from the wall.
Variations in input voltage can drastically affect your overall sound and performance and can shorten the life of the components.
BrownBox allows you to discover and supply the optimal input voltage for your personal equipment and your personal sound no matter where you're playing and what voltage you're receiving from the wall.
You'll have a consistent basis for your signal chain every single time-guaranteed.
You just need to find your magic number.
Tube amp, Marshall, Fender, Princeton, Deluxe, Twin Reverb