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Thanks everyone for trying to help me out here. I know how to check what I call a regular transistor but for whatever reason I was thinking that the 2290 / 2879 had some kind of "superpowers" that had to be tested differently (my ignorance). I did not know I could just lift the base off the board I have always removed them and then tested. That is some great information. So now onto the rest of my ignorance or lack of knowledge there of. I am looking at the data sheet If the transistors are rated at 60Wpep at 12.5v which rating/symbol tells me the input drive to get the 60Wpep? Shockwave mentioned 3 times 6W required drive-with that said if the 2290 is providing 60Wpep to 4 2879 then I would assume that each of the 2879 are getting 15Wpep input. So if the 2879 only needs 6W to drive but are getting 3 times the input does the output also increase 3 times its output power? I have went and watched some videos on the LA900 output power performance looks like 400w / 800w pep. So know I am trying to understand if the 4 2879s are rated 400Wpep how are we seeing 800Wpep in the videos? I understand that the increase in voltage has something to do with it but just having a slightly tough time wrapping my head around this.