Mack Amps’ new Gem 2G is a cathode-biased Class A guitar amp that uses Mack’s power-switching feature, which lowers output from 4 watts to 0.4 watts, It has controls for Volume, Gain, and Tone, and footswitchable preamp gain stages/channels. The 2G’s tones come from a 6AC10 triple-triode preamp tube and an EL84 power tube. For more, visit mackamps.com.