Inspired by the JTM45 and refined by Dave Friedman for more punch, clarity, and harmonic depth, the Dirty Shirley has become a benchmark in American-style vintage rock crunch with a British soul. This Synergy module captures that DNA in full: a responsive clean base that takes pedals effortlessly, a thick natural overdrive, and dynamic response that follows both playing touch and guitar volume with precision.
Unlike the original amp, this module offers two fully independent channels, each with its own Gain and Volumecontrols. Both share a 3-band EQ (Bass, Mid, Treble), allowing you to shape your overall tone while adjusting the gain level between channels for rhythm or lead duties.
Each channel includes a Bright switch, fine-tuning the attack and treble response to match your pickups and playing style. The Cathode Select switch (3 positions) adjusts the input stage feel, tighter, smoother, or more open. The module ships set to Dave Friedman’s preferred position (2).
Built for the Synergy modular system, this preamp delivers boutique tube tone with the flexibility of a rack format. It’s a go-to option for classic rock, vintage blues, hard rock, or any player who shapes tone with their hands.
2-year warranty from our workshop.
