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PostPosted: Mon, Dec 04, 2017 1:31pm 
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Joined: Mon, Jul 14, 2008 8:38am
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Location: Amsterdam
The third channel is missing gain and oomph (bass), channel 2+ has more on tap.
My first guess was that it has something to do with the preamp tubes but these are fairly new and it also happens with other tubes. Is there something more I can test?

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PostPosted: Mon, Dec 04, 2017 7:27pm 
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I'd replace the preamp tubes and go from there. These are the usually cause of these symptoms.

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PostPosted: Tue, Dec 05, 2017 3:42am 
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Thanks for the input! I will try some other preamp tubes, hope it solves the problem.

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