Electro-Harmonix · Reverb

Holy Grail Max

9.6V · 80 mA · maker

Electro-Harmonix Holy Grail Max power requirements

9.6V DC · centre negative · draws 80mA · needs a supply of at least 200mA
the voltage it ships for · digital · from the maker
“Power Supply 9.6VDC-200mA power adapter included … Current Draw 80mA” source
Checked 2026-10-13
9V DC · centre negative · draws 80mA
digital · from the maker
“The HG Max draws 80mA at 9VDC with a center negative plug and accepts Boss® and Ibanez® style AC Adapters. Please do not allow the power supply voltage to exceed 10VDC.” source
Checked 2026-10-13

101.6 × 120.65 × 57.15 mm (4.00 × 4.75 × 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.