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Showing results for tags 'el84'.
Problem: While playing recently, my DT-25 suddenly dropped volume significantly and had a slight burning smell. I figured it was a tube(s) going out, so I bought some new ones and replaced them, but when I went to bias them, they were super low! Instead of the 25 (+/-3), they were around 7-8. I turned the bias, but then the weirdest thing happened - any turn up would start an unstoppable climb to 40-50, then it would suddenly kick down to 14 or less. It would stay that way until I turned the bias up again, and then the same thing every time. I checked the fuse, but it seems intact. Since power was going to the tubes, I figure it can't be that anyway. I may be wrong, but I suspected it may be kicking into Low-Volume mode as a safety feature. Any idea what's going on? How do I fix this?
I apologize if someone has already posted something like this, but I couldn't find it... I recently bought a Spider Valve 212 mk1 from a friend. It was in good shape except the tubes, and so he bought some for me to use so it would be in perfect working order (as he didn't want to sell me something that didn't work.) I replaced the power tubes with Sovtek 6l6's, which work perfectly fine, and sound pretty good. They work well with the stock China preamp tubes. He also gave me a matched quartet of Sovtek el84's. I tried both matched pairs in succession, and neither are working. I get a ton of sound coming from the XLR line-out, but I can't coax anything out of the speakers. Both the 6l6's and the el84's are lit, but still no speaker sound. If I put the chinas back in, the speakers start working again. Is there a compatibility issue with el84's on this amp? I work with electronics quite a bit, but I honestly know next to nothing about tubes.