Digitech RPM-1 Vacuum-Tube Rotary Speaker Emulator

in good working condition. 

From Digitech:

When electric organs were first sold, their sound was static and needed some “animation”, so the rotating speaker cabinet was born. The rotating speaker sound became synonymous with blues, jazz and rock & roll, especially when players discovered that they could drive the cabinets’ built-in tube amplifiers into distortion and get a thick, warm sound as well as the swirling rotary effect. (See diagram, page 6) The DigiTech RPM-1 allows you to emulate that classic rotating speaker sound without having to deal with the bulky speaker cabinets that were formerly required. Based on extensive study of rotating speaker cabinets, the DigiTech RPM-1 incorporates speaker emulation circuitry which delivers an authentic sound by recreating the individual horn and cabinet resonances of a real rotating speaker. There are several features of the DigiTech RPM–1 that make it unique: 1) Where competing products use solid-state distortion circuitry to simulate overdriven sounds, the DigiTech RPM-1 is unique in that it uses a vacuum tube analog distortion pre-amp. The 12AX7A pre-amp stage gives you the authentic, rich, warm overdriven sounds previously attainable only with actual rotating speaker cabinets. 2) Only the DigiTech RPM-1 gives you the flexibility to run mono, stereo, or tri-output mode to simulate the most effective microphone arrangements on stage or in the studio. 3) The DigiTech RPM-1 is a ruggedly built, 1U full rack-mount unit, with AC power. No external power supplies or flimsy plastic cases. 4) While other units are based on modified chorus or phase-shifting circuits, only the DigiTech RPM-1 incorporates patented Intelligent Pitch Shifting technology together with VLSI delay and volume modulation circuitry for maximum realism.