Hello I'm building my audio power amplifier. Probably use TDA7294 or LM3886. Audio capacitors must be used to improve the sound quality. I searched web and found there're many used components (audio transistor pairs, audio capacitors and ICs) which are disassembly from old boards. The prices are much much cheaper than brand new stuffs. I'm thinking of buy these parts for my project since my budget is very limited. Does any one has experiences in using disassembly parts? are they reliable?