Return-Path: Received: (qmail 25461 invoked from network); 13 Mar 2001 22:54:14 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 13 Mar 2001 22:54:14 -0000 Received: (qmail 29571 invoked from network); 13 Mar 2001 22:53:51 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 13 Mar 2001 22:53:51 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14cxZK-0007Vy-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 13 Mar 2001 22:47:06 +0000 Received: from anchor-post-31.mail.demon.net ([194.217.242.89]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14cxZG-0007Vt-00 for rsgb_lf_group@blacksheep.org; Tue, 13 Mar 2001 22:47:03 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from pickmere.demon.co.uk ([158.152.117.143]) by anchor-post-31.mail.demon.net with smtp (Exim 2.12 #1) id 14cxYv-00046W-0V for rsgb_lf_group@blacksheep.org; Tue, 13 Mar 2001 22:46:42 +0000 Message-ID: <8t9NRAAqHor6Ewsd@pickmere.demon.co.uk> Date: Tue, 13 Mar 2001 20:24:10 +0000 To: rsgb_lf_group@blacksheep.org From: "M.J.Powell" Subject: Re: LF: Valves References: <005201c0abf2$2e992e40$3025ff3e@oemcomputer> In-reply-to: <005201c0abf2$2e992e40$3025ff3e@oemcomputer> MIME-Version: 1.0 X-Mailer: Turnpike Integrated Version 4.02 S Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: In message <005201c0abf2$2e992e40$3025ff3e@oemcomputer>, Paul writes >Hi all, > >Subject thread is heading back towards my territory! > >The silver EF50's were service issue valves - VR91 for the RAF, ARP12 for >the army. I suppose the navy must have had them as well, but I don't recall >the designation....Red ones were the civilian issue. > >The EF50 has been described as "the valve that won the war" so ubiquitous >was it and so advanced in performance compared to other valves of the time. >I'm sure I recall my late father saying the H2S set had over 100 of them, >and it was unknown for them all to be working simultaneously! > >Might go and dig some out and try a new LF preamp. (need all my 807's for >the PA.....) I made an RF pre-amp using one in about 1948, tuned to Ally Pally TV sound. With a dipole mounted on a broomstick poking out of my bedroom window I received the London TV sound channel loud and clear in south Wales! Mike -- M.J.Powell