This is a fully assembled board with tested.you have no need to solder.
Product Description:
Supply voltage requirements: DC dual 35-70V (power level used) AC 12-15V (protection circuit)
Transformer 300W or more
Class AB: 260W + 260W
Class A: 50W + 50W
When debugging is shipped to AB class delivery, A to class after you installed the heat sink slowly own tune
