I have another Texas Star DX 500V amplifier in from a friend to take a look at. He purchased it new about 2 months ago. It is experiencing high VSWR's on any antenna, but almost flat on a dummy load. This information is according to an experienced tech who has already had it. He asked me to take a look at it. My initial suspicion is the DEI transistors that it came with, based on the information he provided. I won't have an opportunity to look at it for awhile yet. Keep you posted.