Custom-designed by Engl’s Horst Langer, the unit features a pair of 12AX7 preamp tubes with two channels (blue and red) that offer switching between overdrive and high-gain distortion.
Controls include volume and gain and a three-band EQ, and there are also two Gain Lo/Hi and Mid Boost switches per channel.
Other features include a Dual/Single switch that allows the module to be used with older Egnater and Randall hardware, and a three-position cathode select switch to configure the input tube bias setting for optimum input gain and bass response.
The Engl Powerball preamp module is available for $399.99. For more information, head to Synergy Amps.