If anyone is interested in installing an effect loop in their Hammond check out Ebay item 150577513072. I built a few of these - keep watching for them on Ebay if this one sells ....
Bob Schleicher's FX Loop Circuit for the AO-28 preamp : http://www.theatreorgans.com/hammond...ics/fxloop.gif
I built one of these and it works great! All in it probably cost me about $20 in parts and took me less than an hour. I wired it point to point, no PCB.
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