The Instrument
Signal architecture, Orbit III synthesizer, rhythm section, and expression pedal details. Explore the instrument →
Wurlitzer Custom Funmaker 555
A 1974 dual-manual analog home organ with Orbit III monophonic synthesizer — rescued from Craigslist, now getting a second life.
What is this?
Section titled “What is this?”The Wurlitzer Custom Funmaker Model 555 is a dual-manual analog home organ manufactured circa 1974 by the Wurlitzer Company in De Kalb, Illinois. It combines a TOD (Top Octave Divider) organ architecture with an Orbit III monophonic analog synthesizer, a built-in rhythm section, Leslie rotating speaker, cassette deck, and reverb — all packed into a walnut console.
This site documents the ongoing restoration and MIDI conversion of one particular specimen, acquired free from Craigslist in Meridian, Idaho in March 2026.
Shop Log
Acquisition story, power-on assessment, and ongoing maintenance notes. Read the log →
MIDI Conversion
ESP32-S3 design for bidirectional MIDI — scanning 153 inputs and driving analog circuits. Leslie control, Orbit III CV, voice selection, and expression. See the plan →
Reference
IC identification, oscillator replacement options, service manuals, patents, and community resources. Browse reference →
Quick Specs
Section titled “Quick Specs”| Model | Wurlitzer Custom Funmaker 555 |
| Year | ~1974 (manual copyright 1973) |
| Manuals | Upper (Swell) 44 keys + Lower (Great) 44 keys |
| Synthesizer | Orbit III — 25 mini-keys, monophonic VCO |
| Pedalboard | 13 notes |
| Speaker | Leslie rotating speaker |
| Extras | Cassette recorder, reverb, Swingin’ Rhythm |