stumblinman Posted October 17, 2013 Share Posted October 17, 2013 Wow, I'm a little worried now. Turned amp on, in standby, and let it warm up for a couple minutes. Came back to turn it to on, and main fuse below power cord blew. Of course I don't have a spare 2A 240V fuse lying around, so now I'm dead in the water until tomorrow. Being a DT25, I wouldn't suspect the transformer issue that the DT50's had, so I'm a little worried. Unless it's just a bad fuse, I'm not sure what else to do. Best Part? Warranty expired 8-26-13. Sent a support ticket in anyways to document the issue, and hopefully Line 6 will cover any necessary work because they have always treated me very well in the past. I will assume the best and prepare for the worst. Perhaps Technical Bulletin #59 DOES apply to DT25's... Let you all know more as my saga continues. Looks like I'll need to make new tones and go FOH for the cancer benefit my band is playing November 5th... Fun! Quote Link to comment Share on other sites More sharing options...
ozbadman Posted October 17, 2013 Share Posted October 17, 2013 Maybe a spike on the line? Quote Link to comment Share on other sites More sharing options...
MGblade Posted October 17, 2013 Share Posted October 17, 2013 Happened to me 2 times in 2 years ,because of tube failure, the first time I just replaced the fuse, but it blown instantly when powering up, took the back panel of and spotted burn marks on one of the tubes., so I guess in you're case it might be a tube failure. Quote Link to comment Share on other sites More sharing options...
stumblinman Posted October 17, 2013 Author Share Posted October 17, 2013 I hope either one of you are right. Tubes are only 4-6 months old, but I do gig regularly and play daily. Here's to hoping... Quote Link to comment Share on other sites More sharing options...
stumblinman Posted October 17, 2013 Author Share Posted October 17, 2013 Happened to me 2 times in 2 years ,because of tube failure, the first time I just replaced the fuse, but it blown instantly when powering up, took the back panel of and spotted burn marks on one of the tubes., so I guess in you're case it might be a tube failure. I haven't been able to sleep worrying about this, so I pulled the tubes out and both still look brand spanking new. I will throw the old ones back in after I get a few new fuses in the morning. Going to fire it up with same tubes in and see if it blows again, and if it does I will swap them and see if it will at least stay on out of standby. Good news is that so far I can't find anything that smells burnt.. Quote Link to comment Share on other sites More sharing options...
stumblinman Posted October 18, 2013 Author Share Posted October 18, 2013 Yep. Put new fuse in and watched V3 light up like a Christmas tree. Shut it off, put in "old" tubes that had less hours than my current ones, biased and back in business. Something must have just flat out failed inside that tube. Glad it wasn't something else. Thought for sure when it blew the mains fuse and not the tube protection fuse that it was something more serious. Glad to be wrong. Thanks guys. 2 Quote Link to comment Share on other sites More sharing options...
ozbadman Posted October 18, 2013 Share Posted October 18, 2013 Hey, when you say you biased, how did you do that on the DT25? I've been reading that Line 6 wants you to send it to them to replace tubes (and only with their tubes), and there doesn't seem to be much info on test points or values for biasing. Any advice? Quote Link to comment Share on other sites More sharing options...
MGblade Posted October 18, 2013 Share Posted October 18, 2013 Yep. Put new fuse in and watched V3 light up like a Christmas tree. Shut it off, put in "old" tubes that had less hours than my current ones, biased and back in business. Something must have just flat out failed inside that tube. Glad it wasn't something else. Thought for sure when it blew the mains fuse and not the tube protection fuse that it was something more serious. Glad to be wrong. Thanks guys. Quote Link to comment Share on other sites More sharing options...
MGblade Posted October 18, 2013 Share Posted October 18, 2013 That's good news man. Quote Link to comment Share on other sites More sharing options...
TheRealZap Posted October 18, 2013 Share Posted October 18, 2013 there is just no external bias points it gets biased like any other amp.... settings are public here: http://line6.com/support/page/kb/_/amplifiers/dt50dt25/dt50dt25-faq-r144 Hey, when you say you biased, how did you do that on the DT25? I've been reading that Line 6 wants you to send it to them to replace tubes (and only with their tubes), and there doesn't seem to be much info on test points or values for biasing. Any advice? 1 Quote Link to comment Share on other sites More sharing options...
stumblinman Posted October 18, 2013 Author Share Posted October 18, 2013 Hey, when you say you biased, how did you do that on the DT25? I've been reading that Line 6 wants you to send it to them to replace tubes (and only with their tubes), and there doesn't seem to be much info on test points or values for biasing. Any advice? I put in the original stock tubes because they has only been in for about 2 months before I put some JJ's in there. I was incorrect in my length of time of use too. Checked my purchases and they were 10 months old with daily use and I can't even count how many gigs, so a lot of travel too. I must admit, I probably didn't let them cool down sufficiently EVERY time. Biasing is simple. Hardest part is getting the head out of the cab. All points are easy to access and it goes very quickly. Quote Link to comment Share on other sites More sharing options...
ozbadman Posted October 18, 2013 Share Posted October 18, 2013 there is just no external bias points it gets biased like any other amp.... settings are public here: http://line6.com/support/page/kb/_/amplifiers/dt50dt25/dt50dt25-faq-r144 Aweome! Thanks Zap. I'm new to tube amps so this biasing thing is a whole new experience. Quote Link to comment Share on other sites More sharing options...
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