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Martint
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Mar 24, 2014
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I am using the amp in the US. Tubes were purchased from the tube store which is Canadian. I have always had really good luck buying from that source. Am going to try putting one of the humming tubes in the unit and leaving it on for 24 hours. I do have a ground defeating plug so may try that as well. Once again, thanks for your interest.
Mar 24, 2014
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