somehow your preamp seems to me mis-manufactured in the sense of correct values of bias supply. if the tubes are over- or under- driven that would seem to show your case. Audio Research had done some mis-manufactured units and fixed them at no even shipping cost with no questions asked from anybody. The fix was to change input(grid) resistor values from 1K to 10k. or vise versa(don't remember precisely).
Frustrated with new pre-amp and need advice
Hello all. I just bought a new tube preamp from a well-respected company. I'd rather not say who at this point because I'm still trying to work with them. But I am not real satisfied with the responses I've gotten thus far and need to know if my concerns are valid.
There are two main problems: (1) whenever I change sources or go passed 0 volume, I get a loud thump through my speakers. (2) When I have the phono input selected and i'm listening to an lp (via the internal phono board) but my cd is spinning too, I can clearly hear the CD source. It's intruding into the phono input.
So the manuf. rep has pretty much blamed problem #1 on either my ground connection or my power amp. However, when I use another pre amp (a peachtree decco), this problem doesn't happen. So how can it be a problem with my ground or amp?
For problem #2, they've not commented on what could be going on, and their silence doesn't make me feel warm and fuzzy.
So I'd most like to know if others ever have similar problems with any of their gear, if they indicate a defect in the equipment, or are these issues things I'll have to learn to live with.
I appreciate all comments!
Steve
There are two main problems: (1) whenever I change sources or go passed 0 volume, I get a loud thump through my speakers. (2) When I have the phono input selected and i'm listening to an lp (via the internal phono board) but my cd is spinning too, I can clearly hear the CD source. It's intruding into the phono input.
So the manuf. rep has pretty much blamed problem #1 on either my ground connection or my power amp. However, when I use another pre amp (a peachtree decco), this problem doesn't happen. So how can it be a problem with my ground or amp?
For problem #2, they've not commented on what could be going on, and their silence doesn't make me feel warm and fuzzy.
So I'd most like to know if others ever have similar problems with any of their gear, if they indicate a defect in the equipment, or are these issues things I'll have to learn to live with.
I appreciate all comments!
Steve
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- 12 posts total
- 12 posts total