AudioCircle
Industry Circles => Odyssey Audio => Topic started by: mastercraft1990 on 24 Jan 2019, 03:53 am
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I just picked up a pair of NOS Telefunken Smooth plate, diamond mark tubes for my Candela and had taken delivery of new speakers. I had the tubes in about a day before I set up the speakers and now I'm hearing a faint hum that stops as soon as I turn off the preamp. I'm basically listening to Tidal on a Node 2. I also tried disconnecting the Node as well. Can new tubes cause this and will it go away after they've had a chance to break in?
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Try lifting the ground on the preamp. You can use a cheater plug and see if it is a ground loop noise. I doubt it is your tubes. I hope this helps :)
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I actually swapped out the Candela for a NAD-C 658 BluOS Streaming DAC/Preamplifier. I still have the Stratos Plus Stereo amp and still have the hum. When I remove just one of the cables between the amp and preamp the hum stops. I tried eliminating the ground on the amp and preamp and no change.
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You may already have this type of setup but try connecting all your electronics to one outlet using a power strip. That sometimes helps.
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Easy fix, the hum comes from the interconnects from you preamp to amp. Try to use a different pair if IC.
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I just put on a new set of AudioQuest Black Mambas, I'll try switching them out. I'll be pissed if the are causing it!
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Did removing those cables stop the hum?
Brett
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Maybe this interesting tube noise testing video help:
https://www.youtube.com/watch?v=13n1VCR6UXw