600 ohm replacement 4-spring (4EB3C1B) reverb unit with RCA style input and output jacks. Measures 16-3/4". Long decay design (2.75-4.0 seconds). Mounts horizontally to floor of cabinet with open side down. Fits Hot Rod Deluxe™/DeVille™ and Blues Deluxe™/DeVille™ amplifiers manufactured from 1998-Present.