Tube Amp noise

homersimpsonmc

Hi,

I 'm new tube amp user, and found there is little noise from both speakers.  I initially thought the cause was from the default china tubes.
However, after I replaced all tubes to russian better quality tubes, there is still noise (though improved) when put ear closed to the speakers...

I troubleshoot by remove all input source cables, and turn the volume from zero to 12 o'clock and more , and there is no noise.
When connect back the input cables and turn on my DAC, there is noise.

Please can any C'hing advise how to resolve this problem?  or is it common behavior of tube amp?  since I did not noticed such low noise in my previous Solid State amp.   Would upgrade the DAC input rca cables to higher class with grounding help?

Thanks,
Homer... Donnut.... :-P

japangirl

ground 左amp 未？

snoopy88

Firstly, Remove all input cable. Secondly, plug in the input cable one by one. Find out which pair is generate the problem. Traget the problem equipment and find the solution for kill the noise.

tomtomsuccess

Ground loop.


- 發送自我的 iPhone 大板凳應用

ADA

首先要知道師兄你換左支咩膽先. 知道後才有得分析.
是否換輸入膽? 12AX7? 6DJ8?

thundersnow

回復 1# homersimpsonmc


    膽機電流聲，google 一下你就可以找到有關討論。唔係ground loop, group loop noise 難頂好多！(我兩樣都試過。）

ADA

見個個師兄一口咬定係 ground loop, 但問題係樓主換膽後先出現 noise, 邏輯上點講都唔通喎.
都係一步一步guide住佢先啦.

小弟初步估係支新膽同大陸膽的特性有出入, 最壞情況係用錯膽.

如有錯請大大力指正

tomtomsuccess

Read the question carefully. His speakers got some noise, so he try to solve the noise issue by change some russian tubes, but the provle did not solve.


- 發送自我的 iPhone 大板凳應用

ADA

Read the question carefully. His speakers got some noise, so he try to solve the noise issue by chan ...
tomtomsuccess 發表於 2012-5-27 02:26

係喎 ....我D雞腸水平真係同依家D 80後/90後有得揮.

那麼應該係本身grounding做得唔好. 從新搞過個地線走法先得了.

tomtomsuccess

Did u plug the amp, cdp and computer to the same 拖板？I have the same problem if I plug the computer to the same 拖板.


- 發送自我的 iPhone 大板凳應用