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6v & 90v DC Power supply
Hello Rich,
I restored an old Hammond organ. These generate the tones in a similar manner. A motor (plus a start motor) and over a hundred pickup coils on the long secondary shaft. 20 hours of hard work got it going again but we have accepted the fact that some of the bearings are pretty much over the hill. So it needs 2-3 starts to coax it to run without that mild screeching in the background. Getting spare parts from a company that went out of business 30 years ago just isn't going to happen. So, put the cam thingie on some sort of spindle, with some kind of depth gauge thingie, (maybe a slide pot and a stick), and map the disks, and just make the same waveform from ROM? That has been tried many times. Several rather expensive electronic organs have come out claiming to emulate a Hammond. So far the real enthusiasts do anything to get their hands on the real thing, knowing that there will come a day when the last one croaks. IIRC it was Paul Shaffer (the guy who makes the music at david Letterman's show) who spent the equivalent of a luxury car to have one restored. Regards, Joerg http://www.analogconsultants.com |
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