AmpRx creates products that help you supply your gear with the correct voltage
Here’s the quick rundown: The BrownBox is an adjustable AC power supply for your amp or tube gear that helps you run your equipment at the optimal voltage. Plug the BrownBox into the wall, adjust the voltage and then plug your gear into the BrownBox.
When a tube amplifier is supplied with the proper line voltage, it will sound and respond as originally intended, revealing the circuit’s true harmonic content, and preventing unnecessary, expensive, and frustrating repairs.
BrownBox users testify time and again as to how their amp’s tone, touch and feel have finally come together, providing them with improved harmonics and dynamic amp performance- allowing them to capture the elusive tone they’ve always wanted, every time, everywhere.
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Sold outBrownBox Starter Pack (BrownBoxClub)
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Sold outBrownBox by AmpRx 50/60 Hz
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Sold outBrownie by AmpRx (50/60hz)
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BackLine 2400 by AmpRx
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NEW! THE BROWNIE IS HERE
The Brownie by AmpRx is the latest innovation in voltage optimization, providing musicians with unparalleled control, flexibility, and protection for their gear. Designed specifically for modern tube amplifiers, the Brownie is a voltage controller offering the option to increase and decrease voltage. The Brownie is the ultimate solution for achieving consistent tone and protecting valuable equipment - the first of its kind.
CHECK OUT THIS EPIC SHOUTOUT FROM DR.Z!
CHECK OUT OUR NEW MERCH!
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BrownBox Starter Pack (BrownBoxClub)
Regular price From $442.99Regular priceUnit price per -
AmpRx Coffee Mug
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SaleAmpRx Work Shirt
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AmpRx Team Jumpsuit
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Let customers speak for us
Works great to stabilize input voltage for an older SuperLead
Required equipment for any tube amp. Built like a tank, these look as good as they perform!
The plate voltage on my vintage silver panel Deluxe Reverb is now in a safe range. I feel comfortable running vintage power tubes and it sounds so good. It has just the right amount of sag that was previously missing. Thanks AmpRx!
Yes, I know it's only January, but investing in my amp with a Brown Box was the smartest decision I've made in a long time. Thanks AmpRx. Now I'm safe and secure!
My wall voltage is anywhere from 118v to 129v. I've found my Two Rocks to sound ideal biased at 30ma idle per tube.. Well, if the wall is 128v when I bias to my preferred 30ma per tube, and the next time I play the wall is 120v, my tubes are only idling at 27ma… enough to notice a little stiffness, with less smooth high end, so I’m messing with the gain and EQ trying to find the tone from the night before.
Now I set my Brownies to 120v,, bias the amps, and keep it at 120v. My amps always sound great. I turn my amps on and the tone is there…every time. So I can spend my time playing and not tweaking.
This is a gift for a talented relative, so I can only say it is a heavy, solid piece of equipment that arrived in good order. Nice people at BrownBox who respond to emails.
Received exactly as advertised! Great build quality and functionality. I may need to buy another one!
Excellent product - it's the piece of gear I didn't know I needed. The feel of the amp "under the fingers" is amazing. My pedals seems to sound and feel "better" as well, and I know my amp is happy too.
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!
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!