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<blockquote data-quote="tangmonster" data-source="post: 634171" data-attributes="member: 1581"><p>Blatant thread hogging from us now.</p><p></p><p>The 50ohm in parralel with 270uf cathode bias in that design I referenced is a problem. It had a definite effect even at lower frequencies. Making the design as it is a bit bass shy. </p><p>It was out by around 3dbv at 20hz with my measurements. 20khz was basically spot on though.</p><p></p><p>I have since changed to IR led and lowered the Cathode resistors to get around 11mA. Giving much increased bass.</p><p></p><p>Looking at a phono preamps like this:</p><p></p><p>http://www.diyaudio.com/forums/diyaudio-com-articles/163570-his-masters-noise-thoroughly-modern-tube-phono-preamp.html</p><p></p><p>Makes me want to experiment now with current source on anode for d3a <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Here is my setup (in the making) ( the hardboard pieces are there to hide my vinyl from small fingers and pets. not very good looking but it works):</p><p></p><p><img src="http://img.photobucket.com/albums/v287/tangmonster/IMG_20150801_174557%20Medium.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="tangmonster, post: 634171, member: 1581"] Blatant thread hogging from us now. The 50ohm in parralel with 270uf cathode bias in that design I referenced is a problem. It had a definite effect even at lower frequencies. Making the design as it is a bit bass shy. It was out by around 3dbv at 20hz with my measurements. 20khz was basically spot on though. I have since changed to IR led and lowered the Cathode resistors to get around 11mA. Giving much increased bass. Looking at a phono preamps like this: http://www.diyaudio.com/forums/diyaudio-com-articles/163570-his-masters-noise-thoroughly-modern-tube-phono-preamp.html Makes me want to experiment now with current source on anode for d3a :) Here is my setup (in the making) ( the hardboard pieces are there to hide my vinyl from small fingers and pets. not very good looking but it works): [IMG]http://img.photobucket.com/albums/v287/tangmonster/IMG_20150801_174557%20Medium.jpg[/IMG] [/QUOTE]
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Tube phono preamps
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