Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2BFDD380000EB; Tue, 18 Dec 2012 16:47:28 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Tl4zX-0006jS-Bj for rs_out_1@blacksheep.org; Tue, 18 Dec 2012 21:46:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Tl4zW-0006jJ-Si for rsgb_lf_group@blacksheep.org; Tue, 18 Dec 2012 21:46:22 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Tl4zU-00055N-N8 for rsgb_lf_group@blacksheep.org; Tue, 18 Dec 2012 21:46:21 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id qBILjxgp029418 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 18 Dec 2012 22:45:59 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id qBILjxtx032470 for ; Tue, 18 Dec 2012 22:45:59 +0100 Message-ID: <50D0E412.8070403@iup.uni-heidelberg.de> Date: Tue, 18 Dec 2012 22:45:54 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= 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: <20121218092921.Horde.h2yZX_rSz0VQ0BtRPVIC2uA@posti.anvianet.fi> <20121218100332.Horde.2ASBc_rSz0VQ0CNU8mNkBhA@posti.anvianet.fi> <20121218152622.Horde.XfcUIerSz0VQ0G7_VqKUnlA@posti.anvianet.fi> In-Reply-To: X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Dimitris, Tubes for PAs is not my world (generation) but the topic is most interesting and the webpage too. Good luck and i hope to see some traces from you some time, at constructive QSB :-) [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: e09cca6d8e44a91eadbdfb3e1b8aec09 Subject: Re: LF: Better picture of the 807 based 500kHz TX Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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-global-disposition: G x-aol-sid: 3039ac1dc14650d0e47024c2 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Dimitris, Tubes for PAs is not my world (generation) but the topic is most interesting and the webpage too. Good luck and i hope to see some traces from you some time, at constructive QSB :-) 73, Stefan/DK7FC Am 18.12.2012 22:07, schrieb Dimitrios Tsifakis: > By the way, here is my current 40 m 807 transmitter.This was the first > attempt at building a valve TX. > > people.physics.anu.edu.au/~dxt103/valves/807/ > > I will use the same type of chassis for the 472 kc version but I will > use an old 450-0-450 (50 mA), transformer which also has a 225-0-225 > and 6.3 windings, for a more compact result. My hope is that I can > draw a bit more than 50 mA without overheating the transformer and is > based on the fact that CW is not 100% duty cycle and also I am not > using the other windings to their maximum current ratings. > > 73, Dimitris VK1SV >