jonboyuk Posted January 28, 2018 Share Posted January 28, 2018 Hi all, I bought my DT25 second hand on eBay a couple of years back. The seller said he'd replaced a couple of the tubes himself (I got the feeling he was a little clueless). Anyway, since having it it's been getting a bit - well - weird on me. Around 6 months ago, flipping the pentode -> triode switch causes notable hum. Knocking back to pentode resolved it so I've just used it in this mode. Around 1 month ago, flipping pentode -> triode makes the amp scream out with what sounds like feedback squeal (loudly). The volume control has no impact on the volume of said squeal. Pentode still works fine however. Is this likely to be a tube thing? I should also say that I'm clueless about tubes but have spent hours on these forums reading multiple old posts. I'm thinking if it is, I'll get them replaced. But, since I don't have the originals I'm not sure *exactly* what to replace them with. The knowledgebase says "Chinese-branded 12AX7 preamp tube (1) and Electro-Harmonix EL84 power tubes (2)." but which ones? ie EH 12AX7's? Or what? So confused. Can anyone point out which ones from say here or perhaps another UK based shop? Finally - on a separate note, I just upgraded my DT25 to the 2.0 firmware. I can't find any instructions on how to use the update! The only link on the L6 web site is now dead :( Thanks everyone :) Quote Link to comment Share on other sites More sharing options...
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