Return-Path: Received: from rly-dc04.mx.aol.com (rly-dc04.mail.aol.com [172.19.136.33]) by air-dc08.mail.aol.com (v121.4) with ESMTP id MAILINDC082-b1547d2bb6f235; Sat, 08 Mar 2008 11:14:53 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-dc04.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDC041-b1547d2bb6f235; Sat, 08 Mar 2008 11:14:42 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JY1gp-0007mD-0n for rs_out_1@blacksheep.org; Sat, 08 Mar 2008 16:14:27 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JY1go-0007m3-LQ for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 16:14:26 +0000 Received: from wmsmtp.opaltelecom.net ([62.24.128.253] helo=smtp.talktalk.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JY1gl-0005jF-GV for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2008 16:14:26 +0000 X-Path: TTSMTP Received: from unknown (HELO g3kev) ([78.148.206.52]) by smtp.talktalk.net with SMTP; 08 Mar 2008 16:14:09 +0000 Message-ID: <002501c88137$715cca30$0301a8c0@g3kev> From: "mal" To: "rsgb" Date: Sat, 8 Mar 2008 16:14:09 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: class E psu Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : n I find a regulated psu is not necessary for a class E amp but a very stiff generously rated supply is needed with plenty of C to avoid DROOP In my case I have 24000 mfd and a transformer that supplies at least twice the current that I need. It is more convenient to go for a high voltage and low current psu, ie 20 - 50v at a few amps rather than 12 at big amps. Class C tube amps are another approach because the psu is more manageable ie 3000v at a few milliamps and physically small if you are content with a 50% duty cycle. A good C design is abt 70% efficient G3KEV