So one of my head, an ampeg svt 2 pro, has had a lot of power tube problems over the two years ive owned it. Over a year and a half, five power tubes have failed. They've always been on the right half of the power section (looking in from the rear). I know i set my rig up properly interms of cables. I started using a power conditioner after a while, but the tubes kept blowing. Every tech ive brought it to has said there is absolutely nothing wrong with the amp. Just power tube faliure. I have another svt, and have never had any problems with it. I run them the exact same way. The svt 2 pro was made in vietnam in 2007. Was this a bad year for ampeg? Could there be a bad solder joint somewhere? What should i tell the tech to check out? I dont want to just bring it in and say "a power tube failed" because he will just change the power tubes. I have taken this amp to all the techs in town, and have found the one i trust the most. I just want to see if there is something i should tell him to check out. I dont really have the funds to afford multiple hours of service time. I love this head and really dont want to give up on it.