<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">It was based on an Australian design by (I think…) Trevor Marshall, and then serialised in ETI in the UK, and sold as a BOM with case hardware and panel by Maplin. (I’m not sure Maplin ever produced a complete boxed kit.)<div class=""><div class=""><br class=""></div><div class="">It’s an unusual design. The VCOs are linear, and the switched capacitor filter has a limited sweep range. </div><div class=""><br class=""></div><div class="">I played with one for a while once. The sound was fine, but interfacing with anything else was always going to be a nightmare. </div><div class=""><br class=""></div><div class="">Maplin used to sell a book with all the construction details and circuits. You can probably find a PDF somewhere online if you try hard.</div><div class=""><br class=""></div><div class="">[Google] Turns out there’s a web site:</div><div class=""><br class=""></div><div class=""><a href="http://www.eti4600synthesiser.org.uk/" class="">http://www.eti4600synthesiser.org.uk/</a></div><div class=""><br class=""></div><div class="">Richard<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 25 Jun 2018, at 14:33, Chris Juried <<a href="mailto:cjuried@yahoo.com" class="">cjuried@yahoo.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div style="font-family:verdana, helvetica, sans-serif;font-size:13px;" class=""><div style="font-family:verdana, helvetica, sans-serif;font-size:13px;" class=""><div class=""><div class="">Hi all,</div><div class=""><br class=""></div><div class="">I was looking through some Electronics International magazines and came across the ETI-4600. Does anyone know the history behind the design of this synth?<br class=""></div><div class=""><br class=""></div><div class="ydp9ddd0189signature"><div class=""><font size="2" class="">Sincerely, <br class=""> </font></div><div class=""><font size="2" class="">Chris Juried <br class="">Audio Engineering Society (AES) <var id="ydp9ddd0189yui-ie-cursor" class=""></var>Member <br class="">InfoComm-Recognized AV Technologist</font><span class="ydp9ddd0189postbody"><br class=""><a href="http://www.juriedengineering.com/" rel="nofollow" target="_blank" class="">http://www.JuriedEngineering.com</a> <br class=""><a href="http://www.tubeequipment.com/" rel="nofollow" target="_blank" class="">http://www.TubeEquipment.com</a> <br class=""><a href="http://www.historyofrecording.com/" rel="nofollow" target="_blank" class="">http://www.HistoryOfRecording.com</a> <br class=""></span><a href="http://www.linkedin.com/in/chrisjuried" rel="nofollow" target="_blank" class="">http://www.linkedin.com/in/chrisjuried</a><br class=""></div><div class=""><font size="3" class=""><font size="2" class=""><b class="">Email:</b> <a href="mailto:CJuried@yahoo.com" rel="nofollow" target="_blank" class="">CJuried@yahoo.com</a> <br class=""><b class="">Voice:</b> (954) 478-4355 <br class=""><br class=""><br class="">This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any distribution or copying of this email, and any attachments thereto, is strictly prohibited. If you have received this email in error, please immediately notify me at (954) 300-9972 and permanently delete the original and any copy of any e-mail and any printout thereof.</font></font><br class=""></div></div></div></div></div></div>_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a><br class="">http://synth-diy.org/mailman/listinfo/synth-diy<br class=""></div></blockquote></div><br class=""></div></div></body></html>