jonboyuk Posted May 23, 2016 Share Posted May 23, 2016 Hi all, So I picked up my second hand DT25 last week and it's been great. Now - it's just started humming loudly in Triode mode (but not Pentode). I would say, new tubes, but the guy who sold them to me only recently replaced them. Although by his own admission, he just stuck the 3 new ones in and didn't bias them. Is that likely to be the cause? He used electro-harmonix 12AX7 and EL84 tubes. Any ideas :( Bit sad because I just bought this thing off eBay and now I have no recompense. Sigh Quote Link to comment Share on other sites More sharing options...
Brad_Ames Posted May 24, 2016 Share Posted May 24, 2016 Ouch, I'd say take it to an amp technician if it's having these issues for another day or two. I wouldn't recommend biasing the tubes yourself, nor tampering with it unless you have experience with amps, I killed a fender champ like that x.x Quote Link to comment Share on other sites More sharing options...
jonboyuk Posted May 24, 2016 Author Share Posted May 24, 2016 Cheers Brad, I have NO idea what I'm doing so yea I don't want to kill the amp, or me for that record! Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 24, 2016 Share Posted May 24, 2016 Take it to a Line 6 authorized service center, have it re-tube and properly biased, with the Electro-Harmonix 12AX7 and EL84 tubes. And do a general overall check-up on it. Not having it properly biased creates problems. Quote Link to comment Share on other sites More sharing options...
jonboyuk Posted May 24, 2016 Author Share Posted May 24, 2016 Sadly there is only one in the UK and I'd have to drive 3 hours (each way) to get there and back which I don't have the time for :( I think you're right though, I'll take it to a guitar workshop and get them to replace / rebias the tubes. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 24, 2016 Share Posted May 24, 2016 E&M in Milton Keynes? If you're near London, E&M would be the close one. They're pretty good. If you're near the midlands, there's Mark Wright Music in Northampton. Mark used to be a tech at Line 6 Rugby, when we had a Rugby location. Now he has his own shop and still works on Line 6 gear. He's a good mate and he's knows his stuff. Quote Link to comment Share on other sites More sharing options...
jonboyuk Posted May 25, 2016 Author Share Posted May 25, 2016 I live in Bristol! Any recommendations? London's still a bit far for me :/ (And thanks for your help!) Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 25, 2016 Share Posted May 25, 2016 No problem. From Bristol, it's dealer's choice, Milton Keynes or Northampton. Quote Link to comment Share on other sites More sharing options...
jonboyuk Posted May 25, 2016 Author Share Posted May 25, 2016 I gave Mark a call, VERY nice guy indeed. He said he'd be happy to do the work but thought (without looking) that it was most likely to be valve related and that I should just get someone local to deal with it. But if they can't, I'll just ship it up to him. Thanks for the contact, he's a top guy! Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 25, 2016 Share Posted May 25, 2016 :) Quote Link to comment Share on other sites More sharing options...
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