Has anyone else here had or heard of Tung-sol 6v6 problems or issues. I have a DRRI and I really like the sound of these tubes but my amp just seems to burn these things right up. This is the second set in less than 3 weeks. I have the amp biased to 19.1 and 19.5 miliamps at 428 vdc this comes out to about 70% with the stock rectifier tube. I can put the factory GT #7 6V6-s in or my other set of JJ 6V6s #24 in and run them at 25 to 30 ma at 420 to 425 vdc and they hold up just fine. The JJ's are going back in for now until I can get things sorted out. Should I change the rectifier tube to drop some voltage and get the Tung-sols replaced? Or should I just say the heck with it and move on to something else like Phillips, Sylvania or GE Jan tubes or bite the bullet and get a set of RCA or Brimars. I'm open to suggestions at this point but I have never in all my years had this many issues with one brand of tubes.