AmpRx
Brownie by AmpRx (50/60hz)
Brownie by AmpRx (50/60hz)
5.0 / 5.0
(4) 4 total reviews
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LEARN ABOUT THE BROWNIE
Today, we should be receiving 120V AC from the wall, but depending on where you are and what time of day it is, you can receive anywhere from 120V to 129V. That’s not good for your amplifier, or your ears. The Brownie is a voltage optimizing power supply (aka a voltage controller) designed specifically for modern tube amplifiers, offering the ultimate solution for achieving consistent tone and protecting valuable equipment - the first of its kind.
The Brownie is the first product in the AmpRx line to increase and decrease voltage. Plug the Brownie into the wall, adjust the voltage and then plug your gear into the Brownie.
WHAT MAKES THE BROWNIE SPECIAL?
Modern Versatility: The first product in the AmpRx line to both decrease and increase voltage, compatible with all amplifier types from classic tube amps to modern designs.
Unlock the Perfect Tone: Achieve consistency in tone and protect gear in any environment by dialing in the voltage you need every time you power your amp. Love your tone at 117V? You got it.
Serious Protection: Mitigate disaster. Prevent unnecessary, expensive, and frustrating repairs.
Industry Recognition: AmpRx is trusted by amp techs around the world, top touring artists and their techs, and has been spotted on stages with artists like the Red Hot Chili Peppers, Paramore, Bonnie Raitt, Derek Trucks, Iron Maiden, Lynyrd Skynyrd and more.
Designed for All Musicians: Priced at $299, the Brownie is an affordable way for all musicians to attain professional-grade voltage control.
Reliable and Durable: Hand-wired by humans in the USA, built to last.
TECHNICAL SPECIFICATIONS
Input: 120V/50-60Hz, standard IEC AC cable
Output: One (1) AC grounded outlet
Voltage Adjustment Range:
- Decreasing Increments: -1V (-7V Max Reduction)
- Increasing Increments: +3V, +5V
Fuses: 2A and 4A options included
Max Connected Load: 4A/480W (when paired with 4A Fuse)
Weight: 2.8 lbs
Dimensions: Length: 5(3/4)" x Width: 4" x Height: 4(1/8)"
Construction: Rugged metal enclosure; Powder coated in the USA
A note about B-Stocks: One might call it “scratch-n-dent”, another might call it “relic'ed” (if that’s you, we won’t even charge you extra!). In any case, these units are perfectly functioning on the inside, but have minor imperfections on the outside. Some examples include small paint chips and color inconsistencies.
A note about fuses: If you have a larger amp, consider switching the 2a fuse to a 4a fuse
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Learn How to Use the BrownBox
Love the Brownie. I have not been able to find anything that would make it B Stock - did you guys acidentally put a new Brownie in a B-Stock box? It works perfect delivering 117 VAC to my Mesa Boogie which is by the way what the user manual calls for!
Great pedal for modern amps. I live in the Mojave desert and AC is actually too low at times (115v). Being able to bump up the voltage is very useful. Overall, I suspect that the filtration in the unit contributes to a smother performance and sound, whether or not you are altering the AC.
I’m very happy with my purchase of the Brownie. It’s more compact than the regular Brown Box and more suited to the types of amps I gig daily
Shipping was fast, and I got my second "Brownie" in, it looks and operates just like the non B stock Brownie, and at a discount price!
Let customers speak for us
from 82 reviewsLove the Brownie. I have not been able to find anything that would make it B Stock - did you guys acidentally put a new Brownie in a B-Stock box? It works perfect delivering 117 VAC to my Mesa Boogie which is by the way what the user manual calls for!

BrownBox has been instrumental in keeping my vintage Ampeg SVT operating flawlessly on the road, where voltages can fluctuate wildly!

congratulations to the team of AmpRx

Excellent product. Just what I needed for my vintage 1950s Fender amps.

Really like this unit.
What sold me for this product was Dan, Mick from the pedal show on you-tube and the ability to plug in multiple amps via the 4 receptacles in the back.

I can’t explain how happy I feel with the BrownBox. The difference was immediate — more clarity, cleaner tone, more headroom. I connected my vintage Fender Bassman and Matchless (my oldest amps) and wow, what a relief to know they’re running at the right voltage and not suffering anymore. The sound is so much more alive and natural.
If you care about your amps, especially vintage ones, this is a must. It gives me peace of mind and the best tone I’ve heard from my gear in years. Absolutely recommended!1000 stars!!!! Daniel Uribe

I can’t explain how happy I feel with the BrownBox. The difference was immediate — more clarity, cleaner tone, more headroom. I connected my vintage Fender Bassman and Matchless (my oldest amps) and wow, what a relief to know they’re running at the right voltage and not suffering anymore. The sound is so much more alive and natural.
If you care about your amps, especially vintage ones, this is a must. It gives me peace of mind and the best tone I’ve heard from my gear in years. Absolutely recommended!

Great pedal for modern amps. I live in the Mojave desert and AC is actually too low at times (115v). Being able to bump up the voltage is very useful. Overall, I suspect that the filtration in the unit contributes to a smother performance and sound, whether or not you are altering the AC.

I love The Brownbox! I now have 2 of them and my '72 Marshall Super Lead and '98 Mesa Boogie loves them too! They definitely make a difference in tone and I feel safe that they are running at the voltages that they should, btw extremely fast shipping from AmpRx which I felt I had to mention. Thank You AmpRX!

Great company and Great product!!

Absolutely LOVE AmpRx products.
I bought the Brown Box...leading me to buy the Power Station 1200.....my amps have never reacted and sounded better.
Keep up the Awesome work!
- Coop

I really like the Brown Box. Thanks a lot.

Takes that brittle edge off the top of my Bassman. You don’t know you need it till you get it. Eases stress!
