Return-Path: X-Spam-DCC: paranoid 104; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: *** X-Spam-Status: No, score=3.1 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,INVALID_DATE,MSGID_SHORT 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 tAEJwTaK002143 for ; Sat, 14 Nov 2015 20:58:29 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zxgv5-0006zs-1J for rs_out_1@blacksheep.org; Sat, 14 Nov 2015 19:55:31 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zxgv4-0006zj-PE for rsgb_lf_group@blacksheep.org; Sat, 14 Nov 2015 19:55:30 +0000 Received: from alw.wallawalla.edu ([192.147.172.252] helo=smtp.bcmi.net) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1Zxgu0-0006Ur-LF for rsgb_lf_group@blacksheep.org; Sat, 14 Nov 2015 19:55:29 +0000 Received: from wa7v.ampr.org (alwgw.local.bcmi.net [10.44.201.251]) by smtp.bcmi.net (Postfix) with SMTP id 95709B27 for ; Sat, 14 Nov 2015 11:54:03 -0800 (PST) X-BBS-Msg-Type: P Date: Sat, 14 Nov 15 11:54:02 -0800 Message-Id: <29180@WA7V> From: yo2is@wa7v.ampr.org (Szigy) To: rsgb_lf_group@blacksheep.org In-Reply-To: your message of Sat, 14 Nov 2015 19:06:26 +0000. <4510637253.20151114190626@chriswilson.tv> X-RFC2822-Warning: Obsolete format in Date: header X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Subject: Re: LF: Valve LF amps and tank coil size / voltage rating? 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: 5074 ÿþÿþFrom: YO2IS Hi Chris, you have to look in the G3LDO's book, 'The LF Experimenter's handbook', pag.45, there is a fine description of a tube PA by GW4ALG, using in PP the feritte core with 58mm OD, material 3C85. Inspired by this article have built myself a 2xGU13 (813) PA, 2000V x 0.4A, class C, it works ok in LF or MF ! 73 & DX, Szigy. -----my reply to----------------- Date: Sat, 14 Nov 2015 19:06:26 +0000 rom: Chris Wilson rganization: Gatesgarth Developments o: yo2is@wa7v.#sewa.wa.usa.noam ubject: LF: Valve LF amps and tank coil size / voltage rating? eply-To: rsgb_lf_group@blacksheep.org 14 November 2015 If you built a decent power valve LF amp what is the realistic voltage imit to ferrite cored tank circuits? In other words, what plate oltage / current is the limit for say a ferrite cored toroidal coil efore you have to move on to an air cored (very large?) tank coil? nyone have any links to the limiting figures? All the highish power alved LF amps I can find are commercial and size was probably not an ssue, but MAYBE they were pre ferrite toroids, I am not sure when hey came into usage. Thanks. - est regards, Chris 2E0ILY mailto:chris@chriswilson.tv