The Mesa Boogie Express 550 Guitar Amp Head has two channels, each of which features its own Gain, Treble, Mid, Bass, Reverb, and Master.
The Express 5:50 Guitar Amp Head is part of a very popular line of amplifiers from the people at Mesa/Boogie. This is a two-channel amplifier that delivers 50 watts of tube-driven power. You can buy the Mesa Boogie Express 550 as a head, or as a combo amp. There are five 12AXY tubes in the preamp section and two 6L6 tubes in the power amp section. The amp gets its name from the Mesa/Boogie Patented Multi-Watt Channel Assignable Power system.
This system allows you to select from the following:
- one power tube operating in pure Class A Single-Ended, producing 5 Watts
- two tubes operating in pure Class A Push-Pull, producing 25 watts
- two tubes operating in the Mesa/Boogie proprietary Dyna-Watt Class A/B power, producing 50 Watts.
The Express 5:50 also features a tube-buffered Spring Reverb, and a tube-buffered effects loop.
Each channel features its own Gain, Treble, Mid, Bass, Reverb, and Master controls. Each channel has a toggle switch to alternate between two modes. Channel 1 has Clean or Crunch, and Channel 2 has Blues or Burn. Both channels share a five-band graphic EQ that you can select if you want to use the sliders or a preset contour via toggle switch.
The Express 5:50 also has a separate solo control that supplies a boost to the signal for lead sections. The included four-button footswitch toggles Channels, Reverb, Graphic EQ, and Solo.