FYI... another apparent Sovtek 5AR4 tube failure. A couple weeks ago I turned on my SWL 9.0, saw sparks around the rectifier tube socket, then the fuse blew. I was afraid I blew out the power supply, so sent the unit back to Dan to check. After testing, turns out everything is intact, and it was apparently just the tube that blew. My units on it's way back, and Dan included a Ruby 5AR4. Kudos to Dan (yet again) for stellar service! For those of you still running Sovtek 5AR4's, watch out!