Microtubes B7K Ultra

Darkglass Electronics Microtubes B7K Ultra power requirements

• 9V DC · centre negative · draws 120mA

  digital · from the maker

  “The Microtubes B7K Ultra has a current draw of 120mA. Only use a regulated 9V DC adapter with a center-negative plug.” source

  Checked 2026-10-13

Size

125 × 96 × 57 mm (4.92 × 3.78 × 2.24 in)

Width × depth × height, from the manufacturer.

Power supplies that can run it

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

• Walrus Audio Canvas Power 1515 outputs · isolatedSweetwater
• Voodoo Lab Pedal Power 3 Plus12 outputs · isolatedSweetwater
• Truetone 1 SPOT Pro CS1212 outputs · isolatedSweetwater
• MXR M238 ISO-Brick10 outputs · isolatedSweetwater
• Strymon Zuma9 outputs · isolatedSweetwater
• Voodoo Lab Pedal Power 38 outputs · isolatedSweetwater