811单端正在制作中～～～～～～～～～

Julien

毕竟你耳朵也不是我耳朵，没什么好讨论的

swuzzy

以下是引用Julien在2005-8-31 23:30:00的发言：

牛进牛出，唯独3D6这种直热管非用直流灯丝不可，因为噪音控制不下来，还有之前的3A5前级也是用的稳压灯丝。

Yifei1406

<img src="attachments/dvbbs/2005-9/20059195650136.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/2005-9/20059195650136.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

出来的电压跟实际很接近，用5AR4,压降很小，能上到415V左右<img src="attachments/dvbbs/2005-9/20059195519318.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/2005-9/20059195519318.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

<img src="attachments/dvbbs/2005-9/2005910145814.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/2005-9/2005910145814.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

用PSU模拟后，发现5AR4压降最小<img src="attachments/dvbbs/2005-9/200591013794.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/2005-9/200591013794.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

<img src="attachments/dvbbs/2005-8/2005831235832174.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/2005-8/2005831235832174.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

<img src="attachments/dvbbs/2005-8/2005831235751586.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/2005-8/2005831235751586.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Yifei1406

Julien

swuzzy

这方面我们有很多人对比了很多，对于旁热管来说，用直流供电几乎没什么坏处，马蹄司的原形就是直流稳压灯丝，但功率直热管使用直流供电的效果变化非常明显，我想是跟灯丝阴极的特性有很大关系吧！

Julien

每个人主观听感都是不同的。
北京的一些玩家，用金封器件稳压给直热管灯丝供电，说是比交流供电更好，这是他们对比的感受。

swuzzy

[em05]

Yifei1406

耳朵贴着喇叭都不可闻！

格格巫

以下是引用swuzzy在2005-8-27 17:59:00的发言：
你就用了一直整流管吗？是不是太勉强了？还有，你的电源牛在哪里？环形的是灯丝牛吗？
你的滤波电容用的太大太多，声音难得活跃起来。
直流灯丝的声音也太死板了，建议用交流灯丝！

811这只管子只能用直流灯丝，交流灯丝噪音大大的有。我做了N次都不能解决。最后一翻电子管手册，811手册明文规定要直流灯丝。以至于我本来设计的交流灯丝不得不改直流，为此还花了50圆钱买肖特基二极管和大型电解电容

jollee

步行者

Julien

进口的牛未必好

Yifei1406

Yifei1406