I just bought one of those little MX-P50M amplifiers from China to give my uBITX a little bit more of a kick and worked for 2 days. Then all of a sudden it stopped working. The little power light still comes on and I can also hear the relay inside click along with the Tx light turning on when I key the transmitter. However, my power supply indicate that there is next to no current being drawn in addition to my MFJ antenna tuner indicating there is next to no power to the antenna. After doing some searching around it sounds like the little MRF186 transistor has caused some trouble for some people. My transistor had no labeling on the package itself. Is it possible that this could be the source of the problem? If so how do I confirm that it is the problem? And if it ends up not being the problem is there anything else that could have gone wrong? I’m not entirely sure what to do. I happen to have a multimeter and can do measurements between certain sections of the circuit if anyone requests.