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_This writeup was graciously provided by HarveyOlsen:_

Electro Music (and later CBS) did not provide factory kits to connect so-called "universal" or general-purpose Leslies to Hammond console organs without internal speaker systems. This was done to protect Hammond dealers who, at the time were responsible for most of Leslie's sales. Any music dealer could sell 147s and other general-purpose Leslies, but only Hammond dealers sold Hammond-type Leslies like the 21H, 22H, and 122. However, the 147 hookup is relatively simple and re­quires only minimal technical experis

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