Julien版主！介绍一下2A3单端的线路，好吗？

土八路

不知何状态下配的，可用到多少？

土八路

Julien

从第一级和第二级6SN7的工作点来看，第一级失真很小，第二级失真较大
第一级电流较大，可能声音比较厚，第二级电流不大，可能作为推动级来说有点小了，受到阻容耦合影响，声音速度会比较慢。2A3是典型应用，他的失真特性也不是最小，但是由于第二级6SN7输出信号失真和他的是反相的，正好抵消，一定程度上改善了整机失真度。第一级第二级是直耦的，都是典型的共阴放大电路，从指标看声音，无论从6SN7音色取向还是6SN7的工作点来说，这个线路都是胆味较浓，但速度较慢的线路，可能不是很通透。整机没有加负反馈，这点对于2A3这类低内阻的三极管来说问题不大，声音应该自然点

Julien

一个是粗略的看图，我那第一个图上有交点，交点的的纵坐标是3.2mA左右

第二是从他图上的实测值来看，屏阻上流过的电流是（280－70）/62K＝3.38mA

土八路

Julien

不是电阻值都一样。。。274B按照道理来说不能太大

土八路

晕！我的图于你的不一样！第一滤波电容用274B时最大到多少？

Julien

以下是引用土八路在2005-2-28 22:00:00的发言：<br/>[em07]<br/>

<br/><br/>有点大了，仿制的时候第一级可以小一点，第二级大一些

Julien

<img src="attachments/dvbbs/2005-2/200522822152841.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/2005-2/200522822152841.gif\');}" onmousewheel="return imgzoom(this);" alt="" />


<img src="attachments/dvbbs/2005-2/2005228221433681.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/2005-2/2005228221433681.gif\');}" onmousewheel="return imgzoom(this);" alt="" />



蓝色的是交流负载线以及实际动态范围

土八路

[em07]

Julien

<img src="attachments/dvbbs/2005-2/2005228213740430.jpg" 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/2005-2/2005228213740430.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-2/200522821381520.jpg" 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/2005-2/200522821381520.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-2/2005228213821512.jpg" 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/2005-2/2005228213821512.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

土八路

[em11][em11][em11]

<img src="attachments/dvbbs/2005-2/2005228214330639.jpg" 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/2005-2/2005228214330639.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

这个吗？

Julien

我先把sunaudio的2A3解释一下[em11]

狂之又狂

出来了就顶出去...。。。经典的经验

魔幻公子

2A3可用俄制2A3EH-G镀金栅丝，EF86输出摆幅是够但是2A3一类的管子输入等效电容比较大，这一级用6J7/EF37/6C6比较好，

土八路

老贴被顶出！
如果现在去做，肯定又是一个境界了！

samyang

最近咋都在挖老贴啊！！！

yl300B

ys-kh

给我等菜鸟看看也好！有新的体验可以在说说吗！

hyzjlwh

这图记一下。