二房失贞

cdsj

按照胆艺轩的6N6并管二房电路装了一台,结果声音失真,小音量时尚可,电位器在11点时开始明显失真,用示波器查看,正弦波的负半周波峰削波,音量开大后几乎成了方波(负半周).前级6N3输出波形正常,将6N6阴级电阻从540欧姆一直加到820欧姆.波形变化不大.将屏级电压由250V加到260多伏也不能解决问题.现在该如何是好?请大家帮帮我!谢谢!

Julien

cdsj

用３００欧的耳机要好一点，正弦波输入Ｐ－Ｐ１Ｖ时，音量电位器在１１点半时开始出现失真．看来只好如此了，再次对Ｊ版表示感谢！学了不少ＤＤ．

cdsj

忘了耳机阻抗了，测试时是用的２７欧姆的耳机，我再用３００欧的试试看．多谢Ｊ版了．

Julien

cdsj

R8;R9改了,是用4个30K的大红炮并的,前面的波形是正常的,R3还要改吗?

Julien

cdsj

将电容耦合改为直耦后,正弦波形还是负半周失真,削顶.真晕.

Julien

cdsj

谢J版.将R8;R9改为15K后阴级电压将会有多大?再一次表示感谢!

Julien

R8，R9都改为15K，5W的电阻
输出电容注意耐压

cdsj

是胆艺轩的6N3+6N6并管耳放.<img src="attachments/dvbbs/2005-9/2005929235553505.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/2005-9/2005929235553505.gif\');}" onmousewheel="return imgzoom(this);" alt="" />

Julien