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6N1 preamplifier with phono
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<blockquote data-quote="Mars" data-source="post: 710947" data-attributes="member: 817"><p>Hi Handsome; yes, the first triode carries both triodes' anode current. I'm measuring current across the R4 and R6, balancing that figure to be the same on both. Which jumper position do you use? I use J4 for more bias voltage across R2. But it seems Broskie recommends J5 position too:</p><p></p><p>"Well, more is what I got when I undid the capacitor resistor bypass and used jumper J5 instead. It was an amazing transformation. The sound stage went wide and deep?but the gain went down, an easy price to pay." from <a href="http://www.tubecad.com/2009/03/blog0161.htm" target="_blank">http://www.tubecad.com/2009/03/blog0161.htm</a></p><p></p><p><img src="http://www.tubecad.com/2009/03/13/ccda%20pcb%20schematic.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I think the 33k resistor choice gave about 4V across the cathode resistor. I'll check the 27k option, I think this might be on target at 3V.</p></blockquote><p></p>
[QUOTE="Mars, post: 710947, member: 817"] Hi Handsome; yes, the first triode carries both triodes' anode current. I'm measuring current across the R4 and R6, balancing that figure to be the same on both. Which jumper position do you use? I use J4 for more bias voltage across R2. But it seems Broskie recommends J5 position too: "Well, more is what I got when I undid the capacitor resistor bypass and used jumper J5 instead. It was an amazing transformation. The sound stage went wide and deep?but the gain went down, an easy price to pay." from [url=http://www.tubecad.com/2009/03/blog0161.htm]http://www.tubecad.com/2009/03/blog0161.htm[/url] [IMG]http://www.tubecad.com/2009/03/13/ccda%20pcb%20schematic.png[/IMG] I think the 33k resistor choice gave about 4V across the cathode resistor. I'll check the 27k option, I think this might be on target at 3V. [/QUOTE]
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6N1 preamplifier with phono
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