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Old 1st November 2009, 11:13 PM   #1
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Default 6L6 PP problem

I have some noise issues with a 4 6L6 power amp, similar to blocking distortion, but this noise appears at half power (about 50 or 60W), even without signal. Tubes aren't matched, and 3 of them are quite old, one is new. Could be a tube mismatching problem?
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Old 2nd November 2009, 09:13 AM   #2
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can you describe the noise a bit more precisely? with or without signal?
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Old 2nd November 2009, 09:45 AM   #3
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Location: Alps:Tube amp designs over 150W, SMPS guru.
More info S.V.P. Since history is unknown, changing all the tubes may be a good idea.
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