Walrus Audio · Modulation

Monumental Harmonic Stereo Tremolo

9V · ≥100 mA supply · maker

Walrus Audio Monumental Harmonic Stereo Tremolo power requirements

9V DC · centre negative · needs a supply of at least 100mA
the voltage it ships for · digital · from the maker
“*Only use a 9 volt DC, Center Negative, 100mA to power the pedal. … 9VDC or 12VDC, 100mA, Center Negative” source
Checked 2026-10-13
12V DC · centre negative · needs a supply of at least 100mA
digital · from the maker
“9VDC or 12VDC, 100mA, Center Negative … 1.7Vpp of Headroom (Use 12V Supply for 2.6Vpp of Headroom)” source
Checked 2026-10-13

74.42 × 121.92 × 57.15 mm (2.93 × 4.80 × 2.25 in)

Width × depth × height, from the manufacturer.

Each has an output that can power it, checked against its published figure. Plan the whole board to see what runs everything.