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Neumann U67 noise issues
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Old 4th September 2012   #1
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Neumann U67 noise issues
I have a Neumann U67, but it's got a weird background noise after warming up.. It sounds a bit like waves or a little fire in the distance...

After cleaning the tuschel connectors as good as possible without any change, I now suspect it has something to do with the voltage switch inside the PSU box. Right now it's set to 220V, but there's the option of switching to 240V inside the box. Here in Denmark we have 230V. Would changing the voltage switch to 240V make a difference you think??
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Old 4th September 2012   #2
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It can be tube issue, also check and clean tube socket connections.

Check this thread : Neumann U67 Noise Troubleshooting

maybe it helps.
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Old 5th September 2012   #3
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Change the tube !
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Old 7th September 2012   #4
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Quote:
Originally Posted by SP2016 View Post
Change the tube !
This. Sounds like the filaments just got alot of flicker noise!
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Old 7th September 2012   #5
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thank you everyone for you replies!

I have ordered a new tube, and I hope it's ok that it's not a vintage NOS Telefunken one...

What do you think? Are all EF86 tubes the same?
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