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6N1 preamplifier with phono
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<blockquote data-quote="Mars" data-source="post: 704151" data-attributes="member: 817"><p>Looking at the first triode of the phono stage: If I enter the stated values for a 6DJ8 triode, the output impedance is:</p><p></p><p><img src="https://lh3.googleusercontent.com/-J1R9jLGKnmA/V5sOEqSSzZI/AAAAAAAAH5s/_NP3YbDmHP4bc-9Q7NKiWUzAYzPNaD16gCCo/s512/6DJ8-phono.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The calculated output impedance is: 2.54k ohm.</p><p></p><p>I am using the svetlana 6N1P data <a href="http://www.svetlana.com/pdf/svetlana/6n1p-svetlana.pdf" target="_blank">http://www.svetlana.com/pdf/svetlana/6n1p-svetlana.pdf</a></p><p></p><p>This is what I glean from the pdf:</p><p></p><p><img src="https://lh3.googleusercontent.com/-vbXx2SFQMGo/V5sMzXnLnpI/AAAAAAAAH5I/2JTeOyy50bw3vcbAvj-Vlw60PEsKwciyQCCo/s640/6N1P-data.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>If I use the same TUBECAD software to calculate a plate resistor that delivers the same output impedance, I get this:</p><p></p><p><img src="https://lh3.googleusercontent.com/-pkClBAZu4Rc/V5sO0bygnqI/AAAAAAAAH6A/D9a1uQafsLcXT4IGMqnC_1Zbp40GfDtTQCCo/s512/6N1-phono.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I need to use a 4400 ohm plate load resistor for the 6N1P? Am I correct? :thinking:</p></blockquote><p></p>
[QUOTE="Mars, post: 704151, member: 817"] Looking at the first triode of the phono stage: If I enter the stated values for a 6DJ8 triode, the output impedance is: [IMG]https://lh3.googleusercontent.com/-J1R9jLGKnmA/V5sOEqSSzZI/AAAAAAAAH5s/_NP3YbDmHP4bc-9Q7NKiWUzAYzPNaD16gCCo/s512/6DJ8-phono.png[/IMG] The calculated output impedance is: 2.54k ohm. I am using the svetlana 6N1P data [url=http://www.svetlana.com/pdf/svetlana/6n1p-svetlana.pdf]http://www.svetlana.com/pdf/svetlana/6n1p-svetlana.pdf[/url] This is what I glean from the pdf: [IMG]https://lh3.googleusercontent.com/-vbXx2SFQMGo/V5sMzXnLnpI/AAAAAAAAH5I/2JTeOyy50bw3vcbAvj-Vlw60PEsKwciyQCCo/s640/6N1P-data.png[/IMG] If I use the same TUBECAD software to calculate a plate resistor that delivers the same output impedance, I get this: [IMG]https://lh3.googleusercontent.com/-pkClBAZu4Rc/V5sO0bygnqI/AAAAAAAAH6A/D9a1uQafsLcXT4IGMqnC_1Zbp40GfDtTQCCo/s512/6N1-phono.png[/IMG] I need to use a 4400 ohm plate load resistor for the 6N1P? Am I correct? :thinking: [/QUOTE]
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6N1 preamplifier with phono
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