Question about Cambridge Audio Azur 640A Amplifier
When my amp is not used for a while (24 - 48 hours or more), output is zero or very soft at first. The volume control has no effect. The sound then fades in with some crackling noises within 2 to 3 minutes.
This is a classic dry joint,,,,,,,,When a box of electronics is assembled thousands of soldered connections are made, to connect all the components together correctly.
During this soldering process a special FLUX is used to ensure the components are electrically connected correctly and reliably....sometime this FLUX creates an air bubble and over time this bubble causes the outside air to corrode the electrical connection and thus the minute electrical voltages cannot pass though this connection correctly....
When you turn on... electricity and heat are generated just enough to allow the voltages to get through the faulty joint...
thats why the sound is weak and changing in intensity...
This fault needs to be located and resoldered. Its not an easy task to locate it... but the resoldering takes only 5 seconds,,,,but as you can imagine searching for it can be time consuming....
You will need a circuit diagram of the amp and some nowledge of the audio path from input to output to search effectively...
But please check your speaker wires very carefully as maybe the simplest thing is causing this problem!!!!!
Cheers From YUBEUT
Posted on Nov 16, 2007
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