Can you damage an amp by undervolting? I.e. run it on almost a totally dead battery for a couple of minutes. I got a very clean Texas star 250 hdv the other day which supposedly tested fine prior to shipping. Hooked it up to my 949 and set the dk to 2 and keyed up to check the swr. The needle went up and immediately all of the way down. Checked wattage and it was like 1/2 w out. I realized the battery was really low and changed it out. Now same thing. Raised dk and nothing. Modulation gives me like 2 Watts out total with the amp on. Its not the radio or the coax. Swr is flat. Any ideas other than blown pills? The pre amp works and if I turn the pre amp on and amp off I get the same low output until modulation. Its only a few weeks old and looks it inside and out.