The second Vibro-King actually came from Pete Townshend’s collection because when Clark Jr. was touring Europe he couldn’t find a Vibro-King combo and Townshend apparently had 10 pairs of custom-made Vibro-King heads and 2x10 extension cabinets. This particular amp-and-cabinet combo was used almost exclusively while recording The Story of Sonny Boy Slim. And while Clark Jr. prefers to use the onboard reverb and tremolo from the Vibro-King, the various stage materials and setups often cause uncontrollable feedback and noise so he’s since opted to use a Strymon Flint.