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Microphonic or noisy tubes in several other positions may not be audible at all. As power tubes are wired in pairs, a failure of this nature in one tube can cause the other tube in the pair to fail with it. In the event you have one or two power tube failures, you can replace that one tube or two tubes to get you through a show, but then replace all four with a matched set see the preceding section. This test is NOT outcome determinative. If you encounter this problem, as noted, shut the amp down immediately. The two main symptoms of a power tube problem are a blown fuse or a tube that begins to glow cherry red. Some failures can be an intermittent short and some can be a tube failure. If so, shut the amp off immediately and replace the tubes.

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