jegarcia Posted February 6, 2016 Share Posted February 6, 2016 Hi guys. How difficult is it to do this?. I just bought one of these units and I live in a country where there is no one that provides this kind of service. Shipping the head to the US for service would be extremely expensive both ways. I'm thinking that I should have bought something else. Your comments would be most welcomed JG Quote Link to comment Share on other sites More sharing options...
radatats Posted February 6, 2016 Share Posted February 6, 2016 its no harder than any other tube amp. BUT you must replace with the same brand and type of tubes (EH EL84 matched set). Do not substitute JJ's or any other brand. If you don't know what you are doing find a professional repair shop. There are voltages in there that can kill you even when it is unplugged! Any amp repair shop can change tubes and bias for you. Here are the instructions for biasing both DT50 and DT25. http://share.myflare.com/rtwSHH 2 Quote Link to comment Share on other sites More sharing options...
Matt_Brown Posted February 7, 2016 Share Posted February 7, 2016 If there are no guitar shops then a qualified electrician might help. Or someone used to dealing with old radios. I did it with a friend of mine after we watched a load of YouTube vids. You will need a voltage tester that is well insulated. If you don't know about these things it is not worth your life to play with it though! Quote Link to comment Share on other sites More sharing options...
jegarcia Posted February 10, 2016 Author Share Posted February 10, 2016 @ radatats Thanks man. Very helpful post. After I posted I made a few calls and it turns out there is an authorized L6 dealer here. They don't sell L6 amps but a tech there did say that if I bring the tubes (I went ahead an order a spare set of EH tubes) and the bias specs (which you provided) they can do the setup. Feeling much better... JG 1 Quote Link to comment Share on other sites More sharing options...
TSMilliner1 Posted April 1, 2016 Share Posted April 1, 2016 @radatats why is it so important to maintain same brand of tubes and not change? Have nothing against EH tubes, but just bought myself a DT25 and not sure how many hours on existing original tubes. Have a brand new set of matched JJ's sitting in my parts box and wouldn't mind using them if possible to save a purchase. Especially as I sold the amp I bought them for. Honestly never heard of having to use a specific brand of tubes with am amp. Is there a biasing problem or something? Thanks Tom Quote Link to comment Share on other sites More sharing options...
DarrellM5 Posted April 1, 2016 Share Posted April 1, 2016 @radatats why is it so important to maintain same brand of tubes and not change? Have nothing against EH tubes, but just bought myself a DT25 and not sure how many hours on existing original tubes. Have a brand new set of matched JJ's sitting in my parts box and wouldn't mind using them if possible to save a purchase. Especially as I sold the amp I bought them for. Honestly never heard of having to use a specific brand of tubes with am amp. Is there a biasing problem or something? Thanks Tom There are some threads on this forum about people, including me, who replaced the stock tubes with other brands (JJ's in my case) and shortly thereafter ran into serious problems. I learned my lesson and will only use the recommended tubes. 1 Quote Link to comment Share on other sites More sharing options...
jegarcia Posted April 2, 2016 Author Share Posted April 2, 2016 @Just Startin' The amp was designed with the recommended tubes and L6 only tests with their recommended tubes. While you may be able to get away with other tubes it is best to go with the L6 recommended set. As Gear Head pointed out you could have unpredictable results not to mention that if your amp is fairly new you may void the warranty. Best Quote Link to comment Share on other sites More sharing options...
ColonelForbin Posted April 2, 2016 Share Posted April 2, 2016 @radatats why is it so important to maintain same brand of tubes and not change? Have nothing against EH tubes, but just bought myself a DT25 and not sure how many hours on existing original tubes. Have a brand new set of matched JJ's sitting in my parts box and wouldn't mind using them if possible to save a purchase. Especially as I sold the amp I bought them for. Honestly never heard of having to use a specific brand of tubes with am amp. Is there a biasing problem or something? Thanks Tom Yeah, somewhere back in the threads one of the technicians from Line6 got into the tube replacement conversation and explained that the amps were designed specifically to use EH tubes, and due to the nature of the power switching of the amp, other tubes present issues that can melt the circuit board, fry the amp, etc. http://line6.com/support/topic/4713-replacement-tubes-recommendations/page-2?hl=tubes&do=findComment&comment=110463 http://line6.com/support/topic/13389-dt50-noise-floor-vs-dt25-noise-floor/?hl=tubes&do=findComment&comment=94862 http://line6.com/support/topic/15605-bias-dt-25-amp/?hl=tubes 1 Quote Link to comment Share on other sites More sharing options...
jegler Posted June 24, 2016 Share Posted June 24, 2016 radatats link is no longer valid - this video details biasing DT25 combo, which is similar to the head: 2 Quote Link to comment Share on other sites More sharing options...
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