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jonkay1 · June 9th, 2007, 08:24 PM

My DRRI is about four years old and does get a lot of use. It used to have so much reverb that you didn't have to turn the reverb up past 3. Now I run it at around 5 to 7, and it's just enough. Also, it's developed this really strange harmonic over- ring when you play two string intervals, especially on the higher notes (7th fret or higher on 1st, 2nd or 3rd string.) It's like an unpleasant harmonic distortion behind the notes. I took it to a local store that had a tube tester, and was amazed to find out that all of my pre-amp tubes were bad. The tech said that my rectifier tube was going bad, but he had none on hand. He said the rectifier tube was running very hot, glowing bright red. The 6v6s' were fine. I replaced the preamp tubes, but the problem(s) still remain. He told me that the amp has internal problems, like a bad resistor or something, and gave me the card of a local tube and amp guru and suggested I take it to him. Any observations or comments, advice?
How long should pre-amp tubes last? Isn't odd that all of them were bad?

June 9th, 2007, 08:24 PM	#1 (permalink)
jonkay1 TDPRI Member Join Date: May 2003 Location: Sacramento, California Posts: 85	Advice sought about problems with DRRI My DRRI is about four years old and does get a lot of use. It used to have so much reverb that you didn't have to turn the reverb up past 3. Now I run it at around 5 to 7, and it's just enough. Also, it's developed this really strange harmonic over- ring when you play two string intervals, especially on the higher notes (7th fret or higher on 1st, 2nd or 3rd string.) It's like an unpleasant harmonic distortion behind the notes. I took it to a local store that had a tube tester, and was amazed to find out that all of my pre-amp tubes were bad. The tech said that my rectifier tube was going bad, but he had none on hand. He said the rectifier tube was running very hot, glowing bright red. The 6v6s' were fine. I replaced the preamp tubes, but the problem(s) still remain. He told me that the amp has internal problems, like a bad resistor or something, and gave me the card of a local tube and amp guru and suggested I take it to him. Any observations or comments, advice? How long should pre-amp tubes last? Isn't odd that all of them were bad?