Along with his custom guitar, Michael Risberg made the most of his time at Spindrift guitars by co-building this “versatile” Marshall-based circuit with Michael Whitney. The DV66R (Duo Voice) is a 50-watt, EL34-based head that is loosely based around a JTM45 platform. For added anger, he wired in a (footswitchable) second gain stage that barks like a JCM800. On top of that, he put in a spring reverb that is harnessed by three controls—mix, tone, and dwell—just like the ’60s Fender 6G15 units that inspired it.