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Blown Main Fuse On Dt25...1 Month Out Of Warranty


Best Answer MGblade , 16 October 2013 - 10:57 PM

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.

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#1 stumblinman

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Posted 16 October 2013 - 06:10 PM

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!


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#2 ozbadman

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Posted 16 October 2013 - 08:35 PM

Maybe a spike on the line?


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#3 MGblade

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Posted 16 October 2013 - 10:57 PM   Best Answer

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.


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#4 stumblinman

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Posted 17 October 2013 - 12:25 AM

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...


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#5 stumblinman

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Posted 17 October 2013 - 03:04 AM

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..


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#6 stumblinman

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Posted 17 October 2013 - 05:11 PM

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.
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#7 ozbadman

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Posted 17 October 2013 - 08:58 PM

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?


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#8 MGblade

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Posted 17 October 2013 - 09:47 PM

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.


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#9 MGblade

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Posted 17 October 2013 - 09:49 PM

That's good news man.
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#10 TheRealZap

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Posted 18 October 2013 - 04:33 AM

there is just no external bias points it gets biased like any other amp....

settings are public here:

 

http://line6.com/sup...50dt25-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?


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#11 stumblinman

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Posted 18 October 2013 - 05:47 AM

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.
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#12 ozbadman

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Posted 18 October 2013 - 09:47 AM

there is just no external bias points it gets biased like any other amp....

settings are public here:

 

http://line6.com/sup...50dt25-faq-r144

 

Aweome! Thanks Zap. I'm new to tube amps so this biasing thing is a whole new experience.


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