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DIY For Audio
Phono preamp kit: output impedance vs RIAA EQ
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<blockquote data-quote="vinyljan" data-source="post: 769296" data-attributes="member: 14424"><p>I bought a PH12 phono amp kit (to build) from tubes4hifi, pic of assembled kit from the web </p><p></p><p><img src="http://i67.tinypic.com/2cdh99g.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Some info on the build is: "For accurate RIAA EQ, the output of each channel should be connected to a 100K or 250K volume control or 250K balance control"</p><p></p><p>I didn't understand how a volume control that is adjustable could effect RIAA, so I contracted Roy via email and he explained as follows:</p><p></p><p><img src="http://i64.tinypic.com/2hqwfhc.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>So I learned something about impedance vs resistance, thought someone might find it interesting :thinking:</p></blockquote><p></p>
[QUOTE="vinyljan, post: 769296, member: 14424"] I bought a PH12 phono amp kit (to build) from tubes4hifi, pic of assembled kit from the web [IMG]http://i67.tinypic.com/2cdh99g.png[/IMG] Some info on the build is: "For accurate RIAA EQ, the output of each channel should be connected to a 100K or 250K volume control or 250K balance control" I didn't understand how a volume control that is adjustable could effect RIAA, so I contracted Roy via email and he explained as follows: [IMG]http://i64.tinypic.com/2hqwfhc.png[/IMG] So I learned something about impedance vs resistance, thought someone might find it interesting :thinking: [/QUOTE]
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DIY & Tutorials
DIY For Audio
Phono preamp kit: output impedance vs RIAA EQ
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