Rare Danelectro Spring King (spring reverb) for sale. Most reverbs currently available are digital, which sound good but can feel cold. This effects unit uses a real spring, and its natural, warm tone is unique. It's old, but comes with the box and manual. The unit itself shows some signs of use. Spring reverb effects unit, with volume, tone, and reverb controls. - Brand: Danelectro - Model Name: Spring King - Function: Spring Reverb - Controls: Volume, Tone, Reverb - Features: Kick pad Thank you for looking.