Quote from: J M Fahey on August 03, 2011, 02:03:09 PM

Please take another somewhat larger and better illuminated picture of everything you have in that chassis and explain what you have there.
What I don't understand is why you have so many heatsinks there.
What are you using as a power amp and speakers?

There are pre-amp , tube simulation , SMPS and class D amp. But I think classD amp does not work well for this application. I have  to go back to AB amp.
And for speaker it is normal PA type,15" .

I have just reduce the gain of first OP-amp (Reversed circuit) . And leave the last OP-amp of tube simulation as buffer. So it seem OK for me now.

Thank you so much for all of your advice. This is what I call the power of network. We are friends.
This is the original unit with noisy problem . Sound like "SSSS....." .
I have reversed the circuit as your comment. Sound is tighter and less noise.  . But it is not enough for me so I have to do something further.

Hello guys , I have build Tonemender preamp and Tube simulate follow these schematics. But there is too noisy.Even through  I have try run pream and simulation separately,there is noisy. But when connect  preamp to  simulator it seem double noisy.
How to improve?