When introduced in 1993, the twin Vibro-King was a Custom Shop amp—handwired and vintage styled. The Bruce Zinky-designed circuit wasn’t a reissue of a classic Fender tone machine, but rather a re-imagining of what a Fender amp could be using key elements of older amps.
Over the years the circuit was refined–the early models used an EL84 tube for reverb, but it was replaced with a 6V6 to give it more durability. As it evolved it’s found favor among some very high-profile players, most notably Pete Townshend, who uses them as the foundation for his stage tone, but also Tom Petty, and blues wunderkind Gary Clark Jr.
The three-speaker array is based on three 25-watt alnico Jensen P-10R-Fs, not unlike what you might see in a tweed Bassman.