《前置放大器电路设计的发展史》27页扫描大图

小鬼头

《前置放大器电路设计的发展史》扫描大图

《前置放大器电路设计的发展史》扫描大图

《前置放大器电路设计的发展史》扫描大图

《前置放大器电路设计的发展史》扫描大图

《前置放大器电路设计的发展史》扫描大图

湖泊之战

好东西那~~要好好读几读。[em11]

drb888

但扫描的效果不是很好。能否把这些图片发到我的邮箱里？
邮箱：drb6131200@163.com
等我自己慢慢整理好，再打印出来好好学习。

语蓝

藏之～～

aeon

家家乐

小鬼头

最初是发表在家电论坛上，并在本坛转贴过：

http://www.hifidiy.net/dispbbs.asp?boardID=7&replyID=166&ID=54&skin=0

《前置放大器电路设计的发展史》读后感(9309字节)(小鬼头)
《前置放大器电路设计的发展史》是一篇由日本人是枝重治写的评述文章。按我估计，日文原版文章很可能刊登在日本杂志《无线电技术》或《无线与实验》（即MJ杂志）。

我手上的是，印在上海翻译出版公司十多年前推出的《音响与电视》丛书之《音响与电视技术荟萃》1988年7月第一版的上册里。该《荟萃》一书分上下册成套售卖，时价8.65元，当时属较贵的书，我于1989年元月购买。原书显示，该译文首先载于《北无通讯》1987年第2期（北京无线电厂的内部通讯？）

那天本坛网友发烧女友说“珍本”呀，故我特意留意了一下印数，显示为1-15000本，算一般吧。相信今天有好多人没有这本书，没看过这篇文章。我身边认识的几位音响爱好者及电子爱好者也都没这本书。说一定真让发烧女孩说中了，实际印数不多而成为“珍本”。

英国哲人培根说过，读史使人明志。我对这句话的理解是，读史可以清醒头脑，因为事实一再证明，往日的历史经常在今天重演。虽然这篇文章是讲电路发展的历史，技术性较强，但它谈的远远不止于技术。透过这篇文章，或许你发现，当今音响界的种种现象、种种怪态，在昔日早已发生和出现。因此，我才把这篇技术味甚浓的文章推荐给各位网友。若有不当之处，还请多多谅解。

这篇文章仅仅谈前置放大器的电路，并且大部分笔墨是写LP唱头的设计，也只写到八十年代初。但10多年来，这篇文章我读过不下二三十次，它已深深地刻在我的脑海里。如果说有什么东西影响我的音响观（我的音响观帖子链http://www.jd-bbs.com/showthread.php?s=&threadid=141535&highlight=%BB%F9%B1%BE%D2%F4%CF%EC%B9%DB），除了自己的亲身实践之外，就要算这篇文章了，因为我觉得我所看过的任何一篇音响文章都没法与之相比。也常想，如果有同样高水平的论述功率放大器、音源、喇叭的文章，那该多好啊！





（下面才是我写的由问号组成的“读后感”,

每次重读这篇《前置放大器电路设计的发展史》，总令我产生不少思考与感概。即使是今天，我对着这篇文章，再翻一翻近个把多月来从英文DIY论坛偷师的几十页笔记，还是生出良多感想，更多的却是疑问：

————1、怎么看待几十年前的经典名器？今天的音响器材是否真的全面超过上一辈、上两辈、上三辈的？

这文章时里头提到的天朗AUTOGRAH音箱，我小鬼头手上的日本《无线与实验》（即MJ杂志）就有该音箱仍在登广告售卖。也记得香港发烧音响杂志里，那个叫弹弓杨的玩家写手，前几年把玩JBL很早期的号角舞台音箱时，评价是多么的高。


————2、看到里面所讲拙劣的QUAD 33电路。怎么看，其电路结构也与我们当年的收录机线路一模一样。这先否确实印证了原作者所说的光有技术不行呢？再进一步想，器材设计制造是否技术为先？是否要有文化底蕴？


————3、文章说到的JBL SG-520前置（好象今天日本市场仍卖大概折为人民币二万元）竟然用锗管这种电子业界众所周知的拙劣器件，也可取得这么好的音效。文章还说到装制直流放大器需要元件的高质素。这两处讲的都是器件，说法不是有矛盾吗？零件素质真的那么绝对重要？是不是我们今天也应该给机子换上价值二三千元的JENSON铜管银膜电容？


————4、文章说，七八十年代开始大量出现晶体管器材（应包括线路设计）。到今天还不是一样？哪个厂家还不是争先恐后去出新机型？目的是抢钱吗？

再看看放大器的电路形式，究竟有多少电路真正能超越八十年代以前的范畴？厂家一再宣称的许多放大器的新电路、新技术，难道不是炒冷饭吗？里面有多少唬人的东西？

美国名厂Threshold和Pass的奠定者、著名音响设计师、拥有多项电路设计专利的Nelson Pass先生在 DIYAudio论坛里曾很认真地讲过：今天95%的Hi-End前置放大器，电路比不上麦记早期前置JC-2（此机比《前置放大器设计发展史》专门介绍的LNP-2还要早）、今天95%的Hi-End功率放大器，电路比不上KRELL的第一台风扇版机子KSA50。

香港发烧音响杂志陈瑛光主编在93年一篇介绍二手器材的文章里写到，不少业内人士认为，KRELL的第一款KSA50是其顶峰之作，音色是最靓的。这与Pass所说相互印证。


————5、今天的音响是否高度商业化了？音响器材的素质究竟是不是媒体所说的那么好？媒体蒙闭了我们多少？

英文DIY论坛里深有研究的网友说，现今欧美HIEND数码器材所用的菲利浦转盘CDM12 PRO，远及不上其第一代全金属转盘CDM1。还有其它鬼佬网友论证，认为原因是：第一代转盘设计时，厂家对产品心中无数，因此不惜用最稳当的技术办法，生产第二代时，厂家懂得多了，就开始简化一些，越往后就越这样，因此造成音质变差。

这可以算作是音响被商业化的一种“成果”展现吗？

谈到商业化，我想引用一下早前我在讨论高级转盘是否骗钱问题时写过的帖子——————



有些在技术上很简单的事情，拿到市场上，就不是那么一回事了。

N年前，我还在校园里，

小鬼头

<img src="attachments/dvbbs/2005-8/200581205151887.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581205151887.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/20058120529185.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/20058120529185.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

小鬼头

<img src="attachments/dvbbs/2005-8/200581204958300.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204958300.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
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<img src="attachments/dvbbs/2005-8/200581205029782.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581205029782.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
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小鬼头

<img src="attachments/dvbbs/2005-8/200581204822799.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204822799.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204831840.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204831840.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204841351.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204841351.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
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小鬼头

<img src="attachments/dvbbs/2005-8/200581204642949.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204642949.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
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小鬼头

<img src="attachments/dvbbs/2005-8/200581204459274.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204459274.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204515292.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204515292.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204527987.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204527987.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204542332.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204542332.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-8/200581204557326.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-8/200581204557326.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

lxyi

[em11]

小鬼头

以下是引用drb888在2005-8-12 10:28:00的发言：
但扫描的效果不是很好。能否把这些图片发到我的邮箱里？
邮箱：drb6131200@163.com
等我自己慢慢整理好，再打印出来好好学习。

这27张图全是高像素扫描的。。。当时我发帖时说“连毛毛都能看到”[em11]

你点击一张打开再看，你就知道他的效果了[em06][em06][em06][em05]

lxyi

[em09]

raul

<p>扫得不错,若能PS一下更好.</p><p>另外在网页中使用大图片时,打开时间很长,建议打包.</p>

jerman

学习，怎么这里不能保存网页？

wode

有一个疑惑，失真率低的放大器就是好声的放大器吗？因为看完文章，感觉作者评判机器用的指标（标准），很多时候都是＂失真率＂．记得小鬼头兄说过的一句话，＂在放大电路正确的前提下，好声是调试出来的＂．在这里我们应该如何理解＂正确＂这个概念？是不是理解成失真低于某个数值的放大器就是＂正确＂的放大器？或者换句话说失真高于这个数值的放大器，即使再怎么调整也是惘然（出不来好声了）．是不是这样呢？

wode

<p>偶次失真，奇次失真都是失真．</p>

redmartin

<div class="quote"><b>以下是引用<i>wode</i>在2006-8-11 22:45:00的发言：</b><br/><p>很多人都说蛋机的失真指标不太好（特别是一些单端电路），但是还是觉得好声啊．</p></div><p>你指偶次还是奇次失真·</p>