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

Showing 2 responses by rcprince

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.
I'll add that the Shindo units I have heard are astonishingly quiet, so that would also make me lean towards a noisy tube as the culprit.