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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1647806154.20180409172057@gmail.com> Content-Language: en-US X-Provags-ID: V03:K1:RyEZCsIpgC/jo/0vakK8bLtuS5mNZnUBEWoyJOocLgunXpBWfuR AdQ1TFX5VJPgPH4lXKp2JmcUab39ee/LIkPCVkAj/gP9KUnMe0ctlA2SLInzOAp5BdM8glZ V+enPeWAdjXAUaoC/CgI+KiIxsituoIIWjN9xRuKqSlY3Tj9HKxa4zOUlmv/iOpRLHZARXQ dan2pXYuNLaiBbWbqBlaw== X-UI-Out-Filterresults: notjunk:1;V01:K0:B0lkZTt7QRs=:YOaDTDjQ051ye6KMyqysUI Vgvf8guy3ze/BgiUW8MHuJoprnT/bgG7XXhgjxHr9P+gMNeh3r1ak78hmiHeHK6v2MnoSXzls fPEe3V65Una2Mw5jfyBa83K/NEXmy2UHVBLGGV2jLmxS3vOeIj5E3Zv9qjzhAXdPJHXU3ZPDV xLLUQ7RM1YGDbz3vexQOk27kSstZIKsDG/mwMJbz1/Hdmm5asgwC8zjZDRIKyMaY2e+rXNH9r Azq4MiLpCcUsyes+d9vE7LL2aH7ZWSPUhtKgbbhYzWFjNcwfmzxe2voPxltEX3a7a5ASyrSr+ Z+swzETiHlshz7H4IvlO08GJu+EPlof4KmK+YafhHWxuowSYQF/heFAhiarwpqCTEDbO5iKtg QYF0sb4S0X0yq75f+L/y/otIJDggMXBzGZyjIEhFlmaQL3BzEX8DoCub8eJD9KeE+EddnZ/3u Oj1NiL957lpr+VQSTpk1f7Q6xocNke2cLSr8Z/5/SjkSD59r2HxJ4wdsqPqsZYABUV8LmfIne AnCqAyIPxDa53on1n5j20iqfdEttoCc5ay+XSQqaIR2qOT7HOwC6g7i8OH43Td7H79S1D3cot jvclAK9X6qRu1Nox/HVH6yDY4EE+9xcj7pQSDNf/K1VTEX/D0pO6uZYCAMjOrGzajfnJgxOwv pts45iXRO4u5RgDEMW7D+CMrnxF+K6M6NR6CQ61wWP7eJaRdZCmsZnk2fIwtdyefrZ8u0AO/Z 6+w0HkE1OMz62UeY7TkN4ddF8wcWRQVuuCP89MpjN7eNY5XiITJtWBGMIfk= X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello again Chris, > What's the vertical board in the end of the case? If it's the > multiplier I am not qualified to say what having in the same box as > all that RF might be, but i would have some concerns. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: Re: LF: W1VD amp help - more waveforms Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit 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 Hello again Chris, > What's the vertical board in the end of the case? If it's the > multiplier I am not qualified to say what having in the same box as > all that RF might be, but i would have some concerns. Yes that's what it is and yes that may be a problem. However at the moment for testing and troubleshooting elsewhere, I'm not using that board. There are no wires whatsoever connected to it. > I would mount the driver board, shortened if necessary, The driver board I'm using is as small/short as it gets by me building it. ;-) I had a devil of a time getting everything onto this size board! > I'd be tempted to apply full voltage and see what happens Not yet. My drain spikes are about 64V with 13V supply, 130V with 25V supply, give or take a couple volts in each case. It might be OK (just) at 37.5V but I'm fairly sure 50V would kill these FETs quite efficiently. If/when I blow these FETs this gets moved forward into next year's project queue. I have just one spare FET. And sadly, one can't even get these 'good' ones in the TO-247 package any more. When these die, which we all know will happen sooner or later I will be forced, albeit most reluctantly, to switch to the less desirable and fiddly little TO-220 package. Grr! I've got to get away from this thing for a while. I'll take another look at it tomorrow. Paul