Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,NO_REAL_NAME,UNPARSEABLE_RELAY autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u08BFHrC016353 for ; Fri, 8 Jan 2016 12:15:18 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aHUwW-0001Pl-Ko for rs_out_1@blacksheep.org; Fri, 08 Jan 2016 11:10:52 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aHUwW-0001Pc-Bq for rsgb_lf_group@blacksheep.org; Fri, 08 Jan 2016 11:10:52 +0000 Received: from omr-a010e.mx.aol.com ([204.29.186.54]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1aHUvS-0002l1-75 for rsgb_lf_group@blacksheep.org; Fri, 08 Jan 2016 11:10:51 +0000 Received: from mtaomg-mac02.mx.aol.com (mtaomg-mac02.mx.aol.com [172.26.222.208]) by omr-a010e.mx.aol.com (Outbound Mail Relay) with ESMTP id 7CB8A3800065 for ; Fri, 8 Jan 2016 06:09:29 -0500 (EST) Received: from core-mqb01a.mail.aol.com (core-mqb01.mail.aol.com [172.27.61.11]) by mtaomg-mac02.mx.aol.com (OMAG/Core Interface) with ESMTP id 552E238000082 for ; Fri, 8 Jan 2016 06:09:26 -0500 (EST) Received: from 91.84.71.16 by webprd-a06.mail.aol.com (10.72.19.167) with HTTP (WebMailUI); Fri, 08 Jan 2016 06:09:26 -0500 Date: Fri, 8 Jan 2016 06:09:26 -0500 From: gw8glo@aol.co.uk To: rsgb_lf_group@blacksheep.org Message-Id: <15220ed436f-4a49-35d4@webprd-a06.mail.aol.com> In-Reply-To: MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [91.84.71.16] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.co.uk; s=20150623; t=1452251369; bh=kFzsMwo/hq4L+8dkPbVdODZ3qqRfWbRDTM1OkutC4ec=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=Q/RYAGtVf3xCtP2/SdC6vvexisHNlDUQSucpbnbe5ICJs+8UnTFyJCxBFFyplVdYK uqwcy6IIxMiYdpoUzElSUtP/9/N897F/jBPViS8KEWFdNc0dkZixZLWiIj3Fiy77ov dixthDL++Hgr7QA52MeJnbLmt/ul3JojHq7gECPg= x-aol-sid: 3039ac1aded0568f98e66cf9 X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: LF: Decca 5501 Content-Type: multipart/alternative; boundary="----=_Part_17578_1933306660.1452251366254" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 6195 ------=_Part_17578_1933306660.1452251366254 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Does anybody know what ferrite grade is used on the fet driver transformer. I have had one burn out and have rebuilt it but would like to redesign it with better isolation between windings. Have tried various cores but cannot get the same clean waveform. The original is a gapped core of unknown material ferrite. Does anybody have a scrap amp unit that I can use for testing. The finished mods have given 1 kw at 53 volts, can be driven up to 75 volts but dummy load cannot take it!!! 73 Dave GW8GLO ------=_Part_17578_1933306660.1452251366254 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit



Does anybody know what ferrite grade is used on the fet driver transformer. I have had one burn out and have rebuilt it but would like to redesign it with better isolation between windings. Have tried various cores but cannot get the same clean waveform. The original is a gapped core of unknown material ferrite. Does anybody have a scrap amp unit that I can use for testing. The finished mods have given 1 kw at 53 volts, can be driven up to 75 volts but dummy load cannot take it!!!
73 Dave GW8GLO
------=_Part_17578_1933306660.1452251366254--