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The Hammond reverb kit used an AO-35 amplifier (5 tubes.) The spinet's speaker output drove the reverb tank through a bulb limiter, and the amp merely amplified the output of the reverb tank. None of these used an interceptor socket, those were for line-level reverbs added to console-model Hammonds (OrganMate, Fisher Spacexpander, current Trek II.) The spinet reverb kit is different. I have one pulled from an M-3, it's slated for my Extravoice when that's finished. This kit came with the separate cabinet with a Jensen 12" in it (the organ-top speaker cabinet was one option, the extension cabinet was the other option.) Best bet is to check eBay, and call around to some techs, they might have a Hammond reverb kit laying around. However, that AO-35 reverb amp the Hammond reverb kits used are popular for guitar amp conversions, so they generally won't be cheap. You can adapt an AO-44 3-tube reverb amp and spring tank, then cobble any sort of speaker you like. You might be able to find the AO-44 more cheaply.