1. Mode Switch
The Mode switch allows you to switch between three separate modes for each of the three channels, totaling nine different amp sounds in one box.
2. EQ Switch
The EQ switch on each channel allows you to select whether you will use the actual sliders or a preset contour.
3. Multi-Watt Switch
The Multi-Watt switch determines the wattage (90, 45, or 10) and configuration of power each preamp channel will be coupled with to create a classic sound.
4. Channel Voicing Switch
Each channel has a voicing switch: Normal/ Bold on Channel 1, Normal/Thick on Channel 2 (Mark I only), Normal/Bright on Channel 3.
5. Channel-Specific Tone Controls
Each channel features Gain, Master, and Presence controls in the top row, and Treble, Mid, and Bass controls in the bottom row.
6. Sliders/Preset Switch
A separate mini-toggle for each channel located in the left side of the Graphic EQ section allows you to select whether you will use the actual sliders to shape your individual EQ curve or a preset contour based on the ever-popular V curve.
7. Graphic EQ
On-board 5-band graphic EQ comes at the very end of the signal chain so you can shape the final sound with the only consideration being how much of a certain frequency your speakers, cabinets, and ears can handle.
8. Output and Solo
These two control the overall output level of the Mark V when the effects loop switch on the rear panel is switched into the FX ACTIVE position. Solo provides a footswitchable boost.
9. Standby/Power Switches
Standby shuts down part of the high voltage to the power tubes so that they can rest at idle without wear. A built-in variac is also included on the Power switch so that you may run the entire amp on a reduced voltage “brown-out” condition.

Click next to check out the back of the amp and read about its channels...