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Check out this great video about assembling Tusker TDA7294 amplifier board
Check out this great video about assembling Macaque amplifier board
It is good practice to test transistors, even new ones before putting them on pcb. this video shows how to do that easily with digital multimeter.
Precaution is always better then cure.
This video shows why isolation is necessary when fitting transistors & IC's on heat sink.
As heatsinks are made of metal, they are good conductors of heat as well as electricity ( even anodized ones) so using insulation is must.
Metal Tab transistor and ic's require insulating pad as well as insulation washer for proper fitting, watch this video to see how to use them.
Proper mounting of amplifier board is as important as proper soldering. in this video you can see the process.
Note that the amplifier board shown for example, does not have a biasing transistor placed in line with output transistors like our boards, but the procedure is same for our boards also.
Birth of Transistor - Video History