Find the fault location...
First, I can see that the heatsinks on the power devices are not supported, and they may be touching each other. It may not be a problem, but better that they do not touch each other.
Forget the soldering, but u can try this.
Keep the amp open at night and turn off all the lights and prevent any light entering the room. (make it a photography dark room)
Now observe if u can see any spark(s) anywhere on the PCBs.
If u see a spark, then u know what to do.
Do not proceed further if the amp DC voltage is more than 60Volts(+/-30Volts)
Buy one crystal receiver(must be cheap) and with the amp working (u need not connect any source if it is noising as it is, in one channel) probe at identical points on both the channels. Start with the volume set to zero.
U can know as it is, whether the noise is sourced from before or after the volume control.
U have to connect one wire of the receiver to the GROUND/GND of the circuit, and the other at the place of interest. A syringe needle makes a very good, sharp probe.
Remember, u will have to disconnect the speakers to prevent the masking.
This method will locate the section that is responsible for the problem. U have to advance towards the input side if u started from the output point, as THIS may not be the sourcing point of the problem
Be careful: electricity can be dangerous, so take care.
Gajanan Phadte
First, I can see that the heatsinks on the power devices are not supported, and they may be touching each other. It may not be a problem, but better that they do not touch each other.
Forget the soldering, but u can try this.
Keep the amp open at night and turn off all the lights and prevent any light entering the room. (make it a photography dark room)
Now observe if u can see any spark(s) anywhere on the PCBs.
If u see a spark, then u know what to do.
Do not proceed further if the amp DC voltage is more than 60Volts(+/-30Volts)
Buy one crystal receiver(must be cheap) and with the amp working (u need not connect any source if it is noising as it is, in one channel) probe at identical points on both the channels. Start with the volume set to zero.
U can know as it is, whether the noise is sourced from before or after the volume control.
U have to connect one wire of the receiver to the GROUND/GND of the circuit, and the other at the place of interest. A syringe needle makes a very good, sharp probe.
Remember, u will have to disconnect the speakers to prevent the masking.
This method will locate the section that is responsible for the problem. U have to advance towards the input side if u started from the output point, as THIS may not be the sourcing point of the problem
Be careful: electricity can be dangerous, so take care.
Gajanan Phadte