Return-Path: X-Spam-DCC: paranoid 1181; 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=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD 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 tAEMftgt002586 for ; Sat, 14 Nov 2015 23:41:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZxjT7-0008KS-Ix for rs_out_1@blacksheep.org; Sat, 14 Nov 2015 22:38:49 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZxjT7-0008KJ-AY for rsgb_lf_group@blacksheep.org; Sat, 14 Nov 2015 22:38:49 +0000 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZxjS4-00077Q-BW for rsgb_lf_group@blacksheep.org; Sat, 14 Nov 2015 22:38:48 +0000 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id B777E20964 for ; Sat, 14 Nov 2015 23:37:28 +0100 (CET) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3nys484rtYz5vN3 for ; Sat, 14 Nov 2015 23:37:28 +0100 (CET) Message-ID: <5647B7A8.2080100@posteo.de> Date: Sat, 14 Nov 2015 23:37:28 +0100 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4510637253.20151114190626@chriswilson.tv> <825751561.20151114200051@chriswilson.tv> In-Reply-To: <825751561.20151114200051@chriswilson.tv> X-Scan-Signature: 0a4643e586472c13187d293ec5d096c2 Subject: Re: LF: Valve LF amps and tank coil size / voltage rating? Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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: 5084 Hi Chris, Am 14.11.2015 21:00, schrieb Chris Wilson: > OK, but what about wire breakdown voltages? In all the big air cored > LF tanks I have seen the windings are well spaced on ceramic, or > Paxolin type grooved formers, how do I know a close wound toroidal > coil won't break down? > > > I have built a few HV supplies using decent industrial quality iron > cored transformers, the biggest is 5kV at 1.5 Amps, which can also be > fed from a 40 Amp Variac, to drop the primary down. Very well, i see you are thinking in the right dimensions! :-) > I do have a reasonable collection of failed FET's though :) In > fairness user error was the demise of most of them. > LOL! I never built a tube PA so far. But it is time! >> I'll say it againV = 4.44.F.N.A.B (all SI units) >> V = 4.44.F.N.A.B = 176.F.N.A.B ? 73, Stefan