Mesa Boogie Express 550 Plus Guitar Amplifier Head Black Vinyl Black Grille

Quick Overview
Wattage Multi-Watt™ 5, 25 or 50 (Channel Assignable)
Power Tube Type 2x Mesa 6L6
Channels & Modes 2 Channels / 4 Modes
Mode Voicings / Styles Ch. 1 = Clean or Crunch
Ch. 2 = Blues or Burn
Graphic EQ / Reverb / FX / Solo Graphic EQ, Reverb, FX Loop & Solo
Footswitchable Functions Ch. 1/2, Reverb, EQ & Solo
Speaker(s) & Impedance n/a
Weight 38 Lbs.
Dimensions 9 7/8" H x 22 7/8" W x 11 3/4" D
Available Formats Head, Rackmount & 1x12 Combo

Amplifier Features
Amp Type Tube
Chassis Material Aluminum
Rectifier Type Silicon Diodes
Rectifier Tubes n/a
Variac Power Switch n/a
Preamp Tubes 5x Mesa 12AX7
Power Amp Tubes 2x Mesa 6L6
Bias Switch for Alternate Power Tubes Types n/a
Maintenance Free Fixed Bias Yes
Wattage(s) Quick Reference 5, 25 or 50 Watts - Channel Assignable - See Power Amp Details for more information
Built-In Power Amp Attenuation n/a
Power Amp Details (Class & Wattage) Mesa's Patented Multi-Watt™ (Patent 7,602,927) Power Amp, featuring Duo-Class™ (Patent 7,173,488) technology, provides three power and two operating-class options that are channel assignable via two 5/25/50 Watt Power Switches: Choose 1 power tube operating in pure vintage Class A (single-ended), producing 5 Watts - 2 tubes running in pure Class A, Push-Pull, producing 25 Watts or 2 tubes operating in time honored Class A/B power, producing 50 Watts
Convection or Fan Cooling Convection
Number of Footswitchable Channels (or Modes) Two Channels
Number of Style Modes Four
Number of Style Modes Per Channel Two
Types of Style Modes Per Channel Ch. 1 = Clean or Crunch
Ch. 2 = Blues or Burn
Channel Controls Each Channel features Independent 2-Position Style Mode Switch, 5/25/50 Watt Multi-Watt™ Switch, Gain, Treble, Mid, Bass, Footswitchable Reverb, Master and Footswitchable or Auto-Assignable Contour Depth Control
Graphic EQ and/or Contour Selectable 5-Band Graphic EQ and Contour (Footswitchable, Channel Assignable or Off)
Reverb / Effects & Bypass Options Footswitchable, All-Tube, Long Spring Reverb with Independent Channel Controls
Effects Loop & Bypass Options Fully Buffered Series FX Loop
Global Output Level Control n/a
Global Solo Level Control & Bypassable Options Yes (Over each channel when activated)
True-Bypass Options n/a
Tuner Output n/a
External Switching Jack Options and/or Midi External Switching Jacks for Channel 1/2, Reverb, EQ & Solo
Speaker Outputs One 8 Ohm and Two 4 Ohm
Cabinet Simulation - Direct Live/Recording Output n/a
Headphone Output n/a
Slave Output n/a

Cabinet Features
Cabinet Material Marine Grade, Baltic Birch
Standard Finish Options (no extra cost) Black Taurus Vinyl with Black Jute Grille
Custom Finish Options See Custom Finish Gallery
Speaker(s) & Impedance n/a
Transport Assistance n/a