milton10 Posted December 26, 2006 Share Posted December 26, 2006 I am new to tubes so please help me. I just received a Sophia Baby amp about a week ago. The amp sounded great for about 2 days with my Heresy's. Yesterday, when I turned the unit on, the right channel started making scratching sounds (sounds like a noisy pot) and then a squealing sound. I quickly turned the unit off. To make sure that it was not the amp, I switched the tubes around and noticed that the other channel was dead (no sound) and the channel that originally was scrachy was now playing music. When I switched the tubes again the scratchy/squealing sound returned. Looking at the bad tube shows me that the bottom is glowing blue, and the top was not lit at all. Is this normal for the tube to go like this? What could have caused it? Should I return the amp (under its return policy)? Thanks for your help. Milton paniced in Florida Quote Link to comment Share on other sites More sharing options...
Guest " " Posted December 26, 2006 Share Posted December 26, 2006 If the problem follows the tubes as you swap them around, I think you did a good job of pin pointing the problem. If it has a return policy, perhaps you can get the seller to send you some tubes. Unlike SS equipment, Tubes sound nice, but they take a little more involvement to keep going. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted December 26, 2006 Share Posted December 26, 2006 Yup bad tube! get a replacement. It most likely suffered damage to an element in shipping. Quote Link to comment Share on other sites More sharing options...
milton10 Posted December 26, 2006 Author Share Posted December 26, 2006 Thanks to you both for the responses. I will order another one. Should I get a matched pair? Quote Link to comment Share on other sites More sharing options...
jt1stcav Posted December 26, 2006 Share Posted December 26, 2006 I'm not familiar with your amp...if you don't have to adjust the bias on your output tubes, then yes, you need a matched pair. Quote Link to comment Share on other sites More sharing options...
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