Suede·Social
Power supplies·2026 · OCT
Isolated outputs4500mA DC9V · 12V · 18V

01Strymon · jack-by-jack math

How many pedals can the Strymon Zuma power?

9 isolated outputs and 4500mA of DC at 9V, checked jack by jack against 211 pedals at their own voltage.

Plan a board on the Strymon Zuma

02The short answer

Up to 9 pedals, one per output, from 4500mA of DC at 9V.

Built for: A big board heavy on digital pedals: nine 500mA jacks, two of them switchable to 12V or 18V.

  • 201 of the 205 powered pedals in our database run on any jack here at their voltage.
  • Every powered pedal in the database has a jack here that carries it.
  • 4 pedals have no published draw: read the figure off the label and the calculator finds the jack that carries it.
  • 4 passive volume pedals take no jack at all.
  • The Eventide H90 Harmonizer runs from its own 12V adapter, off the supply.
  • The Electro-Harmonix Deluxe Memory Man runs from its own 24V adapter, off the supply.

03The jacks

Per-jack ratings as the manufacturer publishes them. A jack carries a pedal when it offers the pedal's voltage and its rating at that voltage is at or above the pedal's draw.

OutputJacksVoltagemA per jackPedals each jack carries
Jacks 1-779V500mA196 of 201
Jacks 8-929V / 12V / 18V500mAat 9V; less above201 of 201
Total DC94500mA

Every output section is isolated, so a digital pedal on one jack does not share a ground with the pedal next to it. “Pedals each jack carries” counts the 201 powered pedals in our database with a published draw, each at its own voltage. Pedal figures are typical published draws; check each pedal’s label for its voltage and polarity before you plug in.

Current at each voltage

Jacks 8-9 deliver a fixed wattage, so the current falls as the voltage rises. The calculator reads each jack at the voltage its pedal runs at.

VoltageJacks 8-9
9V500mA
12V375mA
18V250mA

04A real board on it

The calculator's example board (a tuner, a compressor, an overdrive, a distortion, a delay and a reverb), run on this supply.

Runs clean

Draw
293mA
Available
4500mA
Headroom
4207mA
Outputs
6 of 9

Open it in the calculator

Source

Per-jack ratings transcribed from Strymon’s published spec. Outputs 8 and 9 switch between 9V, 12V and 18V and derate as the voltage rises: 500mA at 9V, 375mA at 12V, 250mA at 18V. Strymon spec page.

Checked against that page on October 15, 2026.

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