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AO-28 is the model number of the pre-amplifier used in the B-3, C-3, ?RT-3, as well as the A-100 and ?D-100 series HammondOrgans.


Upside-Down AO-28s?

The AO-28's in A-100's are mounted upside-down. To convert an AO-28 between rightside-up and upside-down operation (or vice versa), two wires going to the swell capacitor must be swapped. A photograph detailing the wires to be swapped is available at http://www.rtclogic.com/images/A100_to_B3.jpg (courtesy of ?PeterAbrams.)


External Links

Frequency Response

Here's plots of the frequency response of an actual AO-28, as measured by BradBaker.

http://www.dairiki.org/HammondWiki/AO-28FrequencyResponse

Parts List

?DennisWage has written up a parts list (complete with MouserElectronics part numbers). You can find it at http://www.hammondb3organ.net/parts.php.

The content of this page is Copyright (C) 2000, 2001, 2002 Geoffrey T. Dairiki and the other authors of the content, whoever they may be.
This is free information and you are welcome redistribute it under certain conditions; see http://www.dairiki.org/HammondWiki/opl.html for details.
Absolutely no warrantee is made as to the correctness of the information on this page.