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Background noise

Hello folks. I have a Shindo Monbrison, a wonderful preamplifier, with a wonderful phono section. That said, I noticed a fairly high level of background noise when I turn up the volume without playing music (and this doesn't change by unplugging the interconnects). When the volume control is at its maximum level, you even listen to a little whistle.

Is it normal for a tube preamp or do you think there is a tube problem or another issue? I never experienced this problem in the past, but I've always used SS phono sections.

thanks.
ggavetti
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chadnliz
3,736 posts
 
Sounds normal but I agree with Tvad, hard to tell based solely on info given. Do you notice any difference between other inputs and Phono or is it all the same result?
ggavetti OP
143 posts
 
there is no noise I can hear from the other inputs, even at maximum volume levels. Just to give you a better sense of the loudness of the noise, I just set it at the maximum level, stepped out of my listening room, moved to another room that is approximately 8 meters away from the listening room, and could still hear it.

BTW, I bought the Monbrison 3 months ago from someone who bought it in October. Called Shindo and they told me that the warranty is not transferable...weird policy for a luxury product, if you care about keeping your customers. That said, the Monbrison is just wonderful
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rcprince
3,070 posts
 
Sounds like it could be tube rush from the tube(s) in the phono stage. If you have enough gain from your cartridge/phono stage combination, it may not be noticeable in ordinary listening. Could also be a noisy tube, though, in which case you'll probably need to get your replacement from Shindo, I think they use some unusual tube types in their gear, at least the amps.
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