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I own an Aragon 4004 MK II that has been modified and is now in 2 separate chassis. One of the amps has a distortion making the speaker sound blown. It is worse when the amp is cold. I have noticed that the amp that functions well heats up, the heat sinks get fairly warm. The amp that sounds distorted is dead cold, even after being used. Could there be a biasing issue or an adjustment causing the issue?
You have a failing part somewhere inside there. Bias wouldn't cause that problem.
With out schematics and knowing exactly what modification was done, it's going to be a costly repair as well.
This issue happened right after the modification? Maybe, ask the tech who modified it.
Is there a fuse?
The amps were modded about 15 years ago and have always functioned well, when I had them in my possession. A friend used them for a few years and have been out of my site. That is when I heard the distortion
I will check the fuses, it does sound similar to that so that would be easy.
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