请问如何看电子管的新旧程度。

Saxophone

如图，胆的管体还算清晰

请问如何看电子管的新旧程度。

fu-80

管子至少还有2/3的寿命~~~

Julien

一般情况根据经验判断较多
通常情况老化的管子有这几种情况：
一是管内真空度下降，吸气剂变淡甚至发白
二是管壁窗口处，吸气剂交界处严重发黑，可以明显看出
三是阴极内露出的灯丝发黑，发黄，而正常情况多是发白
四是屏极敞开窗口所对的玻壳有大量溅射物发黑（不是水银色，那种是老练管，出厂前为了稳定所做的处理）
五是云母片大量发黑，发黄
六是原先有蓝光的管子，蓝光渐淡或者变粉红色光
以上几种情况往往管子寿命不算太长了

Saxophone

高手们快快招吧！
TO Julien版：出个教程教一下我们这些菜鸟吧。[em09]

6l6gc

观察玻壳的透明度,跟灯泡一样,越黑就越旧

6l6gc

图中  A 处 ,的银色镜面反光区,越亮越好,因为漏气的原因,用久后发黄,发灰.
如果变白的话管子报废.

请问如何看电子管的新旧程度。

Julien

Saxophone

请教[em11]

Saxophone

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Saxophone

<img src="attachments/dvbbs/2005-6/2005617173958903.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/2005-6/2005617173958903.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

Saxophone

<img src="attachments/dvbbs/2005-6/2005617173931339.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/2005-6/2005617173931339.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />