Return-Path: Received: (qmail 8649 invoked from network); 30 May 2002 23:40:26 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 30 May 2002 23:40:26 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 1028 invoked from network); 30 May 2002 23:40:02 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 30 May 2002 23:40:02 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17DZRl-0000an-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 31 May 2002 00:35:09 +0100 Received: from anchor-post-35.mail.demon.net ([194.217.242.93] helo=anchor-fallback-93.mail.demon.net) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17DZRk-0000ad-00 for rsgb_lf_group@blacksheep.org; Fri, 31 May 2002 00:35:08 +0100 Received: from anchor-post-31.mail.demon.net ([194.217.242.89]) by anchor-fallback-93.mail.demon.net with esmtp (Exim 3.35 #1) id 17DZRi-000BJM-M9 for rsgb_lf_group@blacksheep.org; Fri, 31 May 2002 00:35:06 +0100 Received: from telemetry.demon.co.uk ([194.222.19.114]) by anchor-post-31.mail.demon.net with smtp (Exim 3.35 #1) id 17CEIX-0009mY-0V for rsgb_lf_group@blacksheep.org; Mon, 27 May 2002 07:48:05 +0100 Message-ID: Date: Mon, 27 May 2002 07:47:08 +0100 To: rsgb_lf_group@blacksheep.org From: "Tom Boucher" Subject: Re: LF: Re: Decca component In-reply-to: <78.272cf65d.2a228fb5@aol.com> MIME-Version: 1.0 X-Mailer: Turnpike (32) Trial Version 3.05 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Mike Further to my previous message, my full-bridge PA uses 500 volt FETs (STW20NB50) and runs with a supply of 80 volts on load, 100V off load, so you may want to use a slightly lower voltage varistor for your 67 volt unit. I cannot find any details of the IRF250s used by Decca so don't know what its max voltage rating is. Farnell sell a whole range of varistors and there are 170V (P/No.502-145) and 180V (752-526) versions of the ones I used available. Cheers, Tom G3OLB