p3a amplifier debugging

[aMateRasU]

anyone who can help me, i am having problem with the p3a of my classmate, the amplifier vu meter lights on when volume rises and also the speaker sounds like bo bo bo bog {sorry i cant describe it well}, i hear that also when i rise the bass control {the amp has a tone control}, and when i rise the treble screeching sounds is the output , with the vu meter rising,...

another one is even i adjust the other channels trimmer , the dc out voltage is to high,{this without load speaker..

hope you can help me guys...

 

[richie00boy]

Sounds like a problem with the pre-amp as well as the amp.

 

[Frank Berry]

Sounds like oscillation in the preamp or power amp stages.
It could be bad capacitors in the power supply.
Put a load on the amplifier before you measure the dc offset on the output.

 

[aMateRasU]

Here are the actual pictures,...

ill already finish mine i check it thoroughly so i encountered less problem, this is my clasmates amp, sorry for my bad wiring.... ill tie it when im done,
here are the pictures

 

[aMateRasU]

Here are the actual pictures,...

this are the actual pictures sorry for bad wiring, ill tie it when im finish...