Like four separate amps in one head.
Each of the Tourmaster 4100 amp head's channels has an identical set of controls, but that is where the similarities end.
Clean/Vintage 1 is the cleanest of the four. Within this channel lives a range of Classic tones ranging from pristine sparkle with the voicing switch set to MODERN to a punchy, aggressive drive (think clean JTM) in the CLASSIC mode. Pressing the button to activate the CONTOUR control opens an entire new range of beautiful clean, almost acoustic, tones not often found in a tube amplifier.
Clean/Vintage 2 has a very similar voicing to the Clean/Vintage 1 channel. This channel has more gain, so it can be pushed into mild overdrive. Sweet blues and classic rock tones are easily coaxed out of this channel. The contour knob adds another level of unique flavors.
Overdrive 1: From AC/DC crunch to modern rock, this channel covers a lot of bases all by itself. Dial down the gain and the feel is pure classic rock. Push the gain and enter into more modern, saturated territory. Scoop the mids with the CONTOUR control for monstrous metal or set it for classic British rhythm.
Overdrive 2: The Tourmaster's most intense channel, you'll find ferocious gain with a wide range of tones to suit the '80s shredder as well as the heaviest modern metal player. Scoop the mids with the powerful CONTOUR control for massive crunch or push the midrange for a solo tone that cuts through with serious authority.
Power Grid: This is a really cool feature you will only find on the Egnater Tourmaster amps. Using a group of 5 slide switches on the rear panel, you can set the power output for each channel individually. There is a 3-position slide switch corresponding to each of the four channels and a single FULL POWER/ HALF POWER slide switch. In FULL POWER mode, you can choose between 100w, 50w or 25w per channel. In the HALF POWER mode, you can between choose 50w, 25w or 10w per channel.
With the Tourmaster 4100 amp head, you not only have a wide array of tones available from the preamp channels, but with the Power Grid you can introduce any amount of power tube distortion you wish to each channel: all preset, all automatic.