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301 lines
15 KiB
301 lines
15 KiB
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html lang="en">
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<head>
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<meta http-equiv=Content-Type content="text/html; charset=utf-8">
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<title>The Class-A Amplifier Site</title>
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<link rel="StyleSheet" href="class-a.css" type="text/css" media="screen, print">
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<link rel="shortcut icon" type="image/ico" href="favicon.ico">
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<meta name=description
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content="A site primarily dedicated to the John Linsley Hood Class-A amplifier design, originally published in 1969 and later updated in 1996.">
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<meta name=keywords
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content="John,L,Linsley,Hood,Class-A,amplifier,articles,audio,power,supply,design,circuit,schematic,capacitance multiplier,JLH,class A,jean,hiraga,classe a,monster,le,monstre">
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</head>
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<body background="slate.jpg" bgcolor="#E8E8E8" lang=EN-GB link=blue vlink=blue>
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<div class=Section1>
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<p align=right style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:right'><b>The Class-A
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Amplifier Site</b></p>
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<p align=right style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'>This page was last updated on 17August 2003</span></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'><b><a href="index.htm" title=index.htm>[ Back to Main
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Index ]</a></b></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'> </p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'> </p>
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<p align=center style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:center'><b><span
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style='font-size:20.0pt'>Classic Class-B Schematics</span></b></p>
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<p align=center style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:center'><b> </b></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'>Though these schematics are not for Class-A amplifiers, I
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thought they might be useful for anyone intending to modify or repair these
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classic commercial designs.</p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'> </p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'><a name=index></a><b><span style='font-size:16.0pt'>Index</span></b></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'> </p>
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<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%"
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style='width:100.0%;border-collapse:collapse'>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>NAD 3020</b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'> </span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="nad3020pre.gif" title=nad3020pre.gif>Pre-amp</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="nad3020pre.gif" title=nad3020pre.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="nad3020pwr.gif" title=nad3020pwr.gif>Power Amplifier</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="nad3020pwr.gif" title=nad3020pwr.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="nad3020pwrhr.gif" title=nad3020pwrhr.gif>Power Amplifier</a> </b>(Single
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channel at a higher resolution)</p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="nad3020pwrhr.gif" title=nad3020pwrhr.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="nad3020ps.gif" title=nad3020ps.gif>Power Supply</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="nad3020ps.gif" title=nad3020ps.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>Cyrus 1</b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'> </span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="cyrus1inp.gif" title=cyrus1inp.gif>Input Switching & Volume Control</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="cyrus1inp.gif" title=cyrus1inp.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="cyrus1phono.gif" title=cyrus1phono.gif>Phono Stage</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="cyrus1phono.gif" title=cyrus1phono.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="cyrus1pwr.gif" title=cyrus1pwr.gif>Power Amplifier</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'> </p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="cyrus1pwr.gif" title=cyrus1pwr.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="cyrus1ps.gif" title=cyrus1ps.gif>Power Supply</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><span
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style='font-size:11.0pt'> </span></p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'><a href="cyrus1ps.gif" title=cyrus1ps.gif><span
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style='color:windowtext;text-decoration:none'><img border=0 width=28
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height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>Sugden A48-II</b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><span
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style='font-size:11.0pt'> </span></p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt'> </span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="sugdena48.gif" title=sugdena48.gif>Schematic</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b> </b></p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><span
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style='font-size:10.0pt;color:black'><a href="sugdena48.gif"
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title=sugdena48.gif><span style='color:black;text-decoration:none'><img
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border=0 width=28 height=31 src="gif.gif"></span></a></span></p>
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</td>
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</tr>
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<tr>
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<td width="77%" valign=top style='width:77.76%;padding:0cm 0cm 0cm 0cm'>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b><a
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href="sugden-a48.png" title=sugdena48.png>Parts List</a></b></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:42.55pt;margin-bottom:.0001pt;text-align:left'><b> </b></p>
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</td>
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<td width="22%" valign=top style='width:22.24%;padding:0cm 1.0cm 0cm 0cm'>
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<p align=right style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
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margin-left:5.65pt;margin-bottom:.0001pt;text-align:right'><b><span
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style='font-size:10.0pt;color:red'><a href="sugden-a48.png"><img border=0 width=28 height=31
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src="gif.gif"></a></span></b></p>
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</td>
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</tr>
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</table>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'><b> </b></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'><b><a href="index.htm" title=index.htm>[ Back to Main
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Index ]</a></b></p>
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<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
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margin-bottom:.0001pt'><b> </b></p>
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<div style='margin-left:1.0cm;margin-right:1.0cm'>
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<hr />
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</div>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><span
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style='font-size:8.0pt'>HISTORY:</span></b><span style='font-size:8.0pt'>
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Page created 21/10/2001 </span></p>
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<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><span
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style='font-size:8.0pt'>21/10/2001 Cyrus 1 & NAD3020 schematics added</span></p>
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<p class=MsoNormal style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt'><span style='font-size:8.0pt'>08/11/2001
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Sugden A48-II Schematic added</span></p>
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<p class=MsoNormal style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
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margin-left:1.0cm;margin-bottom:.0001pt'><span style='font-size:8.0pt'>17/08/2003
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Format changed to access gif files directly</span></p>
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</div>
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</body>
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</html>
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