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Strymon Zuma R300 Pedal Power Supply

Written by

Elliot Stent

The Strymon Zuma R300 derives from the original Zuma power supply, a powerful PSU that could provide power to multiple pedals. With the Zuma more suited for larger pedalboard setups with its 9 outputs, the Zuma R300 takes that concept but strips it down. 

Retaining the great low-noise analogue circuitry of the standard Zuma, with fully isolated outputs to ensure clean power for your pedals, the R300 is a smaller low-profile unit that can be mounted under smaller pedalboards. With 5 high-current outputs, the Strymon Zuma R300 can power the thirstiest of pedals, so if you run some sophisticated digital pedals such as Stymon's Mobius, Big Sky or Timeline units, the R300 can handle it!

With 4 9V outputs that deliver up to 500mA of current, the Zuma R300 has another ace up its sleeve. The voltage of the 5th output can be adjusted, letting you choose between 3 different voltages - 9V, 12V and 18V. This means that if you're using a more vintage-style pedal that may typically require a higher voltage, or would like more headroom from an overdrive or boost pedal, the R300 can provide. But this PSU isn't just for smaller boards, as you can daisy chain several low current pedals (such as overdrive, fuzz and compressor stompboxes) from one output, thanks to the amount of current that the Zuma R300 outputs deliver. This potent little PSU can therefore cover all of the bases!

Here's what Strymon say about the Zuma R300 Pedal Power Supply:

Hear your pedals, not your power.

Many popular guitar pedals were originally designed to work with batteries. Since batteries are inherently very low noise and not susceptible to ground loops, these pedals often were not designed to be resistant to noise from power supplies. Our ultra-low-noise design prevents power noise from bleeding into the audio signal, allowing your pedals to deliver the highest possible dynamic range.

12V and 18V option.

Do you have a pedal that requires 12V or 18V? Zuma R300 has you covered. One channel has selectable 9, 12, or 18V output voltages.

Some analog pedals designed for 9V operation may provide higher output and/or more clean headroom when run at higher voltages such as 12V or 18V. However, others will simply start smoking and melting, so please check with the manufacturer of your pedal before operating at a higher-than-standard voltage!

Dual isolation.

Zuma R300’s all analog circuitry offers two stages of isolation. Each of the five output channels is individually isolated from the 24V DC, and the 24V DC is isolated from the AC input power, eliminating ground loop and AC line noise issues. Zuma R300 also provides dual power regulation: Wide-bandwidth optically isolated feedback loops on each channel, as well as on the input, allow both the input and outputs to adjust for changes, ensuring solid output under changing load conditions.

World tour ready.

Playing gigs all around the world? No need to purchase separate power supplies for your international tour. Zuma R300 has automatic worldwide power compatibility built-in (when connected with the appropriate IEC cable). Whether you’re on 120V, 240V, 100V, or any variation in between, Zuma R300 will deliver clean, reliable power to your pedals, even if the venue has dirty power.

Energy efficient.

Don’t let the blue chassis fool you: Zuma R300 is green at heart. Significantly more efficient than linear power supplies, Zuma R300 is able to deliver substantially more current while handling a much wider range of input voltages. The high efficiency design delivers high-current power distribution in a compact unit, for a small carbon footprint and a small pedalboard footprint.

Pedalboard friendly.

Zuma R300’s ultra-low profile design means that it can fit under just about any pedalboard. It also features built in threaded hardware for easy mounting.


Ins & Outs

  • 5 high-current, fully isolated outputs with center-negative polarity
  • 4 dedicated 9V outputs (500mA)
  • 1 adjustable output offers 9V (500mA), 12V (375mA), or 18V (250mA) DC options
  • 500mA per 9V output powers nearly any pedal
  • Delivers a maximum of 36W
  • 5 pedal cables included (5.5mm x 2.1mm barrel connectors, right angle to right angle, 18″ length)
  • IEC cable included
  • 24V Thru jack allows connection to Strymon Ojai or Ojai R30 (sold separately)


  • 5 individual custom transformers (one per channel) deliver clean, consistent power
  • Worldwide power compatibility ensures no-hassle international touring
  • Energy efficient, compact design


  • Lightweight and rugged anodized midnight blue aluminum chassis
  • Ultra low profile design fits under nearly any pedalboard
  • Designed and built in the USA
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