GrahamGunn Posted September 14, 2013 Share Posted September 14, 2013 For all options I-IV on my DT25 there is a resonance with any C# note on the guitar. (It's not the guitar, or the player!) Any ideas? Quote Link to comment Share on other sites More sharing options...
spaceatl Posted September 16, 2013 Share Posted September 16, 2013 Is this a plate rattle? maybe...If so, you might can verify it better with a pencil...tap each tube with a pencil, if you hear it...you have some microphonics and you need new tubes...if the amp is less than 90 days, I think Line 6 has a 90 day warranty on the tubes... Quote Link to comment Share on other sites More sharing options...
saTa Posted September 21, 2013 Share Posted September 21, 2013 Haha, I get the same on a B note... Quote Link to comment Share on other sites More sharing options...
PeterGurton Posted September 25, 2013 Share Posted September 25, 2013 I am getting a similar problem with my spider valve when I play a B maj chord. I hit the chord, then mute the guitar and a resonance note at 192Hz just sings out and wont go away until I turn the standby off. Very annoying as I start in a new band next week. I can send a sound file if need be. Quote Link to comment Share on other sites More sharing options...
jamieabraham Posted September 29, 2013 Share Posted September 29, 2013 My DT25 came fitted with cheap Chinese valves - I changed them for decent quality Russian ones and it sounds much better Quote Link to comment Share on other sites More sharing options...
GrahamGunn Posted September 29, 2013 Author Share Posted September 29, 2013 The amp had (Russian) Electro Harmonix EL84 valves that needed to be replaced. In the end I replaced them with ones from Watford valves. Much better. Quote Link to comment Share on other sites More sharing options...
GrahamGunn Posted September 29, 2013 Author Share Posted September 29, 2013 Also, spaceatl, the pencil test worked much better when the amp was on! However it then sent the whole amp microphonic. Still, as I said, much better now. Quote Link to comment Share on other sites More sharing options...
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