又求助~仿馬蘭士m7噪音問題.

trust1ym · 发表于 2006-5-13 19:37

這套麗特的仿馬蘭士m7.今年2月完成後.但問題不斷出現.先是通電後不能出聲響.在論壇中求助.原來輸出繼電器不能接合.再經各位大哥指點.問題總算解決.聲音是出了.而接著的卻是噪音問題..............今日將輸出級的12au7拔走,只有12AX7做两级共阴放大試聽.噪音全沒.及後在網上看見以下文章..不知是配胆問題還是其他電路問題.請各位指點...謝謝(轉貼)......12AU7  Convergent<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">前级在配胆方面，是最令人伤脑筋的，就是一对<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">12AU7<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">，阁下莫以为有靓声的<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">12AU7<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">，便可放在<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">SL<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">—<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">l<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">身上使用，因为它们随时会发出像沸水，甚至是像调<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">FM<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">广播调不准时一样的噪音，又或引发大量的话筒效应噪音，令用户不胜其烦，任你用尽不同设计的胆套、胆罩，也丝毫没有改善。笔者没有量度过<span lang="EN-US" style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">SL<span style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman';">—<span lang="EN-US" style="FONT-SIZE:

3011 · 发表于 2006-5-14 19:18

提示: 作者被禁止或删除内容自动屏蔽

trust1ym · 发表于 2006-5-13 20:55

謝謝

Julien · 发表于 2006-5-13 20:51

可以参考论坛套件的图纸

trust1ym · 发表于 2006-5-13 20:49

<div class="quote">以下是引用Julien在2006-5-13 20:45:00的发言： 把12AU7的灯丝垫高接地不要和前面的12AX7共用灯丝</div>把12AU7的灯丝垫高接地[em04][em04][em04][em04][em04]對不起...灯丝垫高接地是怎做法?[em04][em04][em04][em04]