Return-Path: X-Spam-DCC: paranoid 1282; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL 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 u1NEvWsS010547 for ; Tue, 23 Feb 2016 15:57:32 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aYEKB-0007sA-C9 for rs_out_1@blacksheep.org; Tue, 23 Feb 2016 14:52:27 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aYEKB-0007s1-1H for rsgb_lf_group@blacksheep.org; Tue, 23 Feb 2016 14:52:27 +0000 Received: from mail-wm0-f45.google.com ([74.125.82.45]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1aYEJ1-0003mc-TG for rsgb_lf_group@blacksheep.org; Tue, 23 Feb 2016 14:52:25 +0000 Received: by mail-wm0-f45.google.com with SMTP id g62so213604683wme.0 for ; Tue, 23 Feb 2016 06:51:05 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=rwZsFDVGd1PTr4TGCdJ26xtfAdpGcDfshVZY9e+NwvY=; b=jokA20/lC2LwwqTNVnWPltjmxggvkadLCN4AHDi11Qa96fUtl43Q6Ry5kYsfepHgpb Xx6U2e2O62QVdQX5mm4PcjhvWnz1NSsXQUSw7WM9VUS7VhgleHNPxssrWUr/ZNCDFxGJ +cN3HhhT63tZbibjWrA0Yr0lv/PsysQxHLmvM09DawEKTL+XrmtkauV7ndB0VeZnWh1y A+RlzaY0nNhBZon9MpCQA4kUbC/hJnyXpmfOCprQlgj2yGjkpnGpuqNKKly1HM6Iakzs 6IGkzuEL6/ULuqA0+F/4c0/a//nCKjxcJhOjNKhEPHkyMF/+pHUhySCPU+kqTrAZyAvE TW/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:content-transfer-encoding:message-id:references:to; bh=rwZsFDVGd1PTr4TGCdJ26xtfAdpGcDfshVZY9e+NwvY=; b=R6dQ24G0D7XkVxAon1SfKce0CpgjbBROJcTGiLF9ausTfACNGYw+wccXHecjuCZwWG ZwKTBvz/LRK3DohRIXCburJO+dtWg0ui1Dv3Kvap/c5g3bg+8BKDvGSkBP1GUzEJXDKN Yw30FxN3jJAfvraWDyzWv8Q3LaObM8eZ9v6JW4xddJsCDIT9krKQFySI93odoevf8Sx3 0RRsMqmpPQXk6ZXB+p9H0cru0w+/CA7nSgUdEok1gIrAVBcNWnF55hG06leA8TKL6+Mg QB3Wtj6ORibwf6emmx2CtUCLiHSOtXEE0m0s99nkT7yRcaWPb1W1Wq0UFl5quq8XX19x ENog== X-Gm-Message-State: AG10YOQbjyo743P60q+WMFa0qSR47LUAYHNDAnwWN/Ap1kz6bcXMdjheDzo++G2cRVsOsA== X-Received: by 10.28.172.132 with SMTP id v126mr19442375wme.28.1456239019582; Tue, 23 Feb 2016 06:50:19 -0800 (PST) Received: from [192.168.1.101] ([82.98.23.94]) by smtp.gmail.com with ESMTPSA id u201sm26543680wmu.11.2016.02.23.06.50.17 for (version=TLSv1/SSLv3 cipher=OTHER); Tue, 23 Feb 2016 06:50:18 -0800 (PST) Mime-Version: 1.0 (Mac OS X Mail 9.2 \(3112\)) From: John Rabson In-Reply-To: <56CC3509.4040308@lineone.net> Date: Tue, 23 Feb 2016 15:50:12 +0100 Message-Id: References: <56CC3509.4040308@lineone.net> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.3112) X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Content-Type: text/plain; charset=utf-8 Subject: Re: LF: Single Stage Class-B 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id u1NEvWsS010547 Status: O X-Status: X-Keywords: X-UID: 6950 I had an RC 411 receiver in which extra diodes been fitted between the two bases.. Without them the distortion was noticeable, but I don’t know whether it would be necessary to do this to prevent crossover distortion in an RF amplifier. John F5VLF > On 23 Feb 2016, at 11:31, LineOne wrote: > > Apart from requiring a higher power supply voltage I find a complementary pair (or pairs) of transistors to be satisfactory and, although the NPN and PNP sets should be reasonably matched to each other, the match between NPN and PNP is not critical. You don't need driver transformers and start with a nice, low output impedance. > > Hugh, M0DSZ > > > john.rabson07@gmail.com Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE