Issue With My Dt50

[birdrules]

Hello, everyone.

 

I've had my DT50 212 for about 6 weeks now, and it's been great up to this point.  For at least the last week it been sounding...not right.  The sound quality has become poor, almost muddy or not very well defined.  It's especially noticeable on the high gain topologies.  Also, in full volume mode I usually have the main volume knob at 2 o'clock.  When I turn the channel volume to 12 o'clock or higher I get a horrible squeal or feedback type sound of some sort.  Does it even when I have the strings completely immobilized by my hands, in both channels and most topologies.  I have very limited experience with tube amps before this one, so I'm not sure what it could be. I've tried a couple of guitars with this, my Ibanez S570, and my JTV 89 and it's the same for both.  I do also have the latest firmware installed.  I would record a sound clip, but I doubt my cell phone would do it justice.  Thanks in advance for any help I get!

[toneman2121]

take a small wooden stick and tap lightly on the tubes. you shouldn't here the tapping through the speaker

[birdrules]

I tapped on the tubes with a stick, and I do not hear it through the speakers.  One tube does seem to be glowing noticeably brighter than the other.  Not sure if that means anything.  

[jrose92081]

The big power tubes or the little preamp tubes? Both matched tubes should be consistent with each other. One brighter or dimmer usually means you have a tube going bad. That would explain your bad noise. I would take it to a authorized service tech for line 6 and have him change the tubes. If they are the little tubes (preamp) you can change them yourself but I would watch a how to video on YouTube first for safety reasons.