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RE: Persisting Start Up Noise in Tube Amp

It sounds like it is reproducible, nice. Your tech does sound capable, what he tried makes sense. Since that didn't find it, and it is reproducible, suggest he use a scope to try to localize it. Might have to null feedback, but it should be visible to help isolate it. Suggest look at B+ then amplification stage by stage. Trigger on the noise at the output stage to correlate because each occurrence of the noise will be different.

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