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Audio and Video Talk
Valves / Vacuum Tubes
Quad 2 - non-standard capacitor values
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<blockquote data-quote="Moonraker" data-source="post: 1077460" data-attributes="member: 24248"><p>Thanks Marantz!</p><p></p><p>For some calculations... We see the QUAD schematic indicate C1=100nF and R7 plus one half of R8 presenting a resistive load of approx 680kOhm (ignore R8).</p><p></p><p>This series capacitor and shunt resistor yield a first order RC highpass filter with the -3dB point at the frequency where the reactance of the 100nF cap equals the resistance of the resistor R7.</p><p></p><p>For C1= 100nF, f= 2.34Hz</p><p>Ditto C1= 220nF, f= 1.06Hz</p><p>Ditto C1= 680nF, f= 0.34Hz</p><p></p><p>You get the idea. </p><p>I still contend that "larger capacitances will have 'no' effect". </p><p>Any possible effect is far outside the amplifier's passband as enforced by other components (read- output transformer). </p><p></p><p>You could even reduce C1 to 47nF with no risk of getting less 'boom' for your buck. Try it and see.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Moonraker, post: 1077460, member: 24248"] Thanks Marantz! For some calculations... We see the QUAD schematic indicate C1=100nF and R7 plus one half of R8 presenting a resistive load of approx 680kOhm (ignore R8). This series capacitor and shunt resistor yield a first order RC highpass filter with the -3dB point at the frequency where the reactance of the 100nF cap equals the resistance of the resistor R7. For C1= 100nF, f= 2.34Hz Ditto C1= 220nF, f= 1.06Hz Ditto C1= 680nF, f= 0.34Hz You get the idea. I still contend that "larger capacitances will have 'no' effect". Any possible effect is far outside the amplifier's passband as enforced by other components (read- output transformer). You could even reduce C1 to 47nF with no risk of getting less 'boom' for your buck. Try it and see.. :) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Quad 2 - non-standard capacitor values
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