Return-Path: Received: (qmail 23144 invoked from network); 24 Feb 2005 23:05:00 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 24 Feb 2005 23:05:00 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1D4S3Q-000H9m-GE for dave@picks.force9.co.uk; Thu, 24 Feb 2005 23:05:57 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1D4S3Q-000H9j-D4 for dave@picks.force9.co.uk; Thu, 24 Feb 2005 23:05:56 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1D4S3z-0004RC-1h for dave@picks.force9.co.uk; Thu, 24 Feb 2005 23:06:31 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1D4Rzc-0001Hg-NJ for rs_out_1@blacksheep.org; Thu, 24 Feb 2005 23:02:00 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1D4Rzc-0001HX-AL for rsgb_lf_group@blacksheep.org; Thu, 24 Feb 2005 23:02:00 +0000 Received: from imo-m15.mx.aol.com ([64.12.138.205]) by relay.thorcom.net with esmtp (Exim 4.43) id 1D4RzZ-000894-Qo for rsgb_lf_group@blacksheep.org; Thu, 24 Feb 2005 23:02:00 +0000 Received: from G4gvw@aol.com by imo-m15.mx.aol.com (mail_out_v37_r3.8.) id l.1f1.362a67c7 (3890) for ; Thu, 24 Feb 2005 18:01:47 -0500 (EST) From: G4gvw@aol.com Message-ID: <1f1.362a67c7.2f4fb6db@aol.com> Date: Thu, 24 Feb 2005 18:01:47 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5003 X-SPF-Result: relay.thorcom.net: domain of aol.com designates 64.12.138.205 as permitted sender X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.056,HTML_MESSAGE=0.001,NO_REAL_NAME=0.178 Subject: Re: Re[2]: LF: Off Topic Ft101zd Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_MESSAGE,NO_REAL_NAME 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

Hi All.

John, I can remember building a Rx using three 807's in which one was strapped as a triode as RF amp. In the mid 1950's they were often for sale at less than one shilling each (I shilling = 12 pence, £1 = 240 pence brfore the UK went decimal coinage). They would run with 45VDC on anode (plate) as HT (B+). For an impoverished schoolboy they were magic! When "three-legged fuses" arrived many of us were shocked that someone had invented a destructable active device which didn't have a filament (heater), couldn't be made to glow purple and would "destruct" without a visible sign to suggest that it had ever been connected to an electrical supply !

However, my ability to construct a Rx in a Woolworth plastic lunch box which would provide test match commentary in a corner of the school yard at lunchtimes with three-legged devices identified only by the colour of a paint spot, gained me so much popularity from my fellows (I cannot now remember what the equivalent epithet to "nerd" was) that I soon stopped believing that RCA 807 = "The Holy Grail" !

73 de Pat g4gvw