Found this E-70 locally for CDN$150. Inside Yamaha E-70 CS-80 sound engine. The Electone E-70, E-50, E-75 (model 7000 in the US) all shared the PASS circuitry of the CS-80 synthesizer. Many same preset sound versions, with a sweepable filter. Lots of fun. I don't think folks are aware of what some home organs can do.
Through recent heavy research and after having stumbled on an amazingly good deal on an Electone D-85, am now convinced that the Yamaha E-70 is in fact 90% of the famed CS-80 synthesizer. I used to own two of those, and always felt the need for a 2nd keyboard ~ which the E-70 provides for playing bass lines and comping chords.
Yamaha D-85 organ. Demos of range of sounds and playing. This is the final best analogue version of the famied Yamaha GX-1 and falls squarely between that model and what would follow in the DX-7 and FX-20.