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RE: MP-3

Try the 12AT7 in the socket by itself in the rear. If there is a Chinese tube in that socket, it can cause one or both channels to quite suddenly go dead. You need an American or Euro tube in there so that won't happen.

You could also look at the remaining tubes and see if any of them have turned white inside- indicative of lost vacuum.

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  • RE: MP-3 - Ralph 14:17:02 12/15/11 (11)
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