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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). If not, you should probably still replace the tubes soon, but you should be able to operate the amp for a short period of time.
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If it happens again, replace the tubes before using the amp again. If you encounter this problem, as noted, shut the amp down immediately. 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. If the tube glows cherry red, shut the amp off immediately. If it happens again, replace your power tubes. Some failures can be an intermittent short and some can be a tube failure. Either are typically indicative of a power tube failure. The two main symptoms of a power tube problem are a blown fuse or a tube that begins to glow cherry red. If you are playing out regularly, I suggest you keep a spare set of power tubes in your gig bag and maybe a few preamp tubes just in case.Ĭrackling, squeals and feedback, excessive noise and muddiness or low output are all evidence of tube problems. But even with regular maintenance, you can still have tube problems. I can not stress enough the importance of changing tubes to keep your amp running optimally. But before you have to worry about shipping your amp for repairs, learning to diagnose a tube problem can keep you rockin’. Tube problems are not infrequent occurrences. After all, tubes are not the cutting edge of technological advancement. Most tube amp problems relate to the tubes themselves.